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The Classes

Scout
He is the fastest of all the classes and has the ability to double-jump. This, coupled with his Scattergun or Force-A-Nature, makes for quick point capture and assault, and can also inflict massive damage if fired at close range. The Scout is traditionally used for objective acquisition, i.e. capturing control points or flags. However, Scouts are particularly good at swift territorial denial and enemy harassment, especially with the stun ability they gain from wielding their trusty Sandman.

http://www.youtube.com/watch?v=VfXcCkxVgyM

Weapon list:
-Primary
Scattergun
Force-A-Nature (knockback for both the shooter and the target, 2-shots per load and many bullets)
-Secondary
Pistol
BONK! Atomic Punch (does not deal damage, makes everything miss the Scout for a short while, then the Scout is slowed down for a bit)
-Melee
Baseball Bat
Sandman (comes with a Baseball that if it hits the enemy, it stuns them, the farther away the longer the stun)

Soldier
The bread and butter general assault unit, the Soldier is one of the most common and simple-to-understand classes, but that doesn't make it one of the weakest. In fact, when played right, the soldier can be one of the most dangerous classes in the field. Equipped with a rocket launcher as their primary draw and a large health pool without being terribly slow, the soldier is a great class for many offensive and defensive roles and easy to pick up and play. But with the slow stray of the rockets and the fact that he's got only four at a time makes the soldier difficult to master. Anticipating the enemy's movements and knowing when to shoot is important.

http://www.youtube.com/watch?v=Mq-XaBmRsg8

Weapons list:
-Primary
Rocket Launcher
-Secondary
Shotgun
-Melee
Shovel

Pyro
The Pyro has the unique ability to set enemies on fire at close range with his Flamethrower, inflicting damage over time through burning. With only a secondary Shotgun to supplement his short range, he must rely on Ambush tactics to catch opponents off-guard.
Pyros are major assets in locating enemy Spies. The Flamethrower will ignite both Cloaked and Disguised Spies; which, when combined with its spread, makes it ideal for finding a Spy attempting to hide or blend in.
Despite his place in the offensive category, the Pyro can also be a useful asset in defense, confusing incoming attackers and defending a Sentry or group of Sentries from meddling Spies. Another useful defensive application is defending Sniper spots from Spies, so the Snipers can do their jobs without fear.
Though he is far from the best in the open field due to his limited range and will often die if the enemy sees him coming, he is great for when the combat is tight, and when others don't see her coming. He is often excellent for causing panic in her enemies if she gets close enough. He is the best class for dealing with enemy charges, since he can get them all running for water or health packs and cripple their momentum.
Another useful asset of the Pyro class is their compression blast, allowing skilled Pyros to reflect projectiles back at their opponents and to clear areas of deadly sticky bombs.

No video out yet

Weapons list:
-Primary
Flamethrower
Backburner (Does lots of damage if you burn enemies from behind, no compression blast)
-Secondary
Shotgun
Flaregun (Sets enemies on fire from a distance, flares are slow like Soldier's rockets but unlike rockets, are affected by gravity)
-Melee
Fire Axe
Axtinguisher (Does lots of damage if enemy is on fire, does little damage against non-burning enemies)

Demo
The Demoman is one of the more complex classes available. With no weapons (outside of his melee weapon, the Scrumpy bottle) suitable for close-quarters combat, the Demoman excels at indirect combat. Armed with a Grenade launcher and Sticky bombs, the Demoman is capable of taking out enemies using clever tricks with the game's physics engine.
The Grenade launcher is very powerful, capable of taking out classes with smaller health-pools (Scouts, Medics, Spies and Engineers) in one or two grenades. The Grenade launcher is perfect for taking out Sentry guns that are around tight corners. Sticky bombs are the perfect tool for defending Intelligence or Control points. Fire a few in some hard -to-see spots, and wait for some prey.
Despite multiple nerfs to the Demoman's weapons through patches, the TF2 community generally agrees that the class remains overpowered at the higher levels of play, due to the sticky bomb launcher's unparalleled versatility as a hard counter to enemy buildings, a means of setting deadly traps, and a powerful mid-range combat weapon to rival the soldier's Rocket launcher.

http://www.youtube.com/watch?v=rxps--huGKY

Weapons list:
-Primary
Grenade Launcher
-Secondary
Sticky Bomb Launcher
-Melee
Bottle

Heavy
As the class name implies, Heavies are the heaviest class in Team Fortress 2, boasting the highest health max, the biggest gun, and the slowest footspeed. Their firepower is very impressive, able to quickly mow down just about anything but an opponent Heavy in seconds, and able to take on large numbers of enemies at once up to a reasonably long range and wide cone of fire. However, revving up and shooting the Minigun brings their already-unimpressive speed to a snail's pace, making them an open (and large) target for any enemy outside their range of fire - especially enemy Snipers.
Making an excellent teammate for a Medic, and being far more effective with allies of any class going alongside them to draw fire, Heavies may seem all-imposing even alone but as the name of the game suggests, they truly shine in a well coordinated team. They may not be the most complicated class, but no good team would be complete without one.
Heavies are an opposite to the quick scout, him being very fast but with low health and not very damaging weapons, while you are very slow, but can soak up huge amounts of bullets and can send a volley of your own.

http://www.youtube.com/watch?v=Cbl3ihE1Wf8

Weapons list:
-Primary
Sasha
Natascha (less damage but each bullet that hits slows the enemy for a few seconds)
-Secondary
Shotgun
Sandvich (Does no damage, heals for some damage)
-Melee
Fists
Killing Gloves of Boxing (slower than fists, but does a bit more damage)

Engineer
Choosing to (usually) build and maintain helpful buildings for the team rather than engage in direct combat, the Engineer is a defensive class that can do many helpful things to give their team much more of a fighting chance. They are perhaps most known for their Sentry guns, automated turrets that can be upgraded via wrench whacks as the Engineer gathers Metal from downed units' dropped weapons, ammo crates and even their own Dispensers (portable machines that replenish the health and ammo of nearby troops). They can also build Teleporters to quickly transport team-mates between two points on the map.
Engineers must keep in mind, however, that all of these constructed machines can be destroyed by enemies, and the builder or another Engineer should be on-hand for repairs should one wish to keep their creations running for long - especially if built closer to enemy territory.
Like the Spy, your job gets harder while people get better, so prepare to adapt as an Engineer.
Engineers aren't completely out of the game in direct combat though; with a trio of generic, yet capable weapons and the ability to assist themselves by staying around their own buildings, they can put up a great fight and are adept in medium-to-close ranged combat.

http://www.youtube.com/watch?v=ybmrVVs4mpQ

Weapons list:
-Primary
Shotgun
-Secondary
Pistol
-Melee
Wrench
-Special
PDA (Allows Engy to build/destroy his own buildings, 1 of each)

Medic
The Medic is the primary healing class in Team Fortress 2. They are typically found near the front-lines, healing wounded team-mates while trying to stay out of trouble. The Medic carries mediocre weaponry (if mastered, he can fight as well as other classes), as his main focus is to heal other players using the Medigun. While the Medigun is focused on an ally, that ally gets an additional bonus of up to 150% of his maximum health. If the medic stops healing, that bonus health will slowly degenerate back to the maximum health for that class. This bonus is called overheal or buffing. While healing, the Medic's ÜberCharge bar will fill up to full, at which point he may make himself and an ally invulnerable or give his patient 100% crits for up to 8 seconds.

No video out yet

Weapons list:
-Primary
Syringe Gun
Blutsauger (heals the Medic slightly for every syringe that hits)
-Secondary
Medigun (Gives an Ubercharge at 100% charge, making self and an ally invulnverable for a short time)
Kritzkrieg (Gives an ally's weapon more damage for a short time, does not make them invulnerable)
-Melee
Bonesaw
Ubersaw (gives 25% charge per hit)

Sniper
The Sniper is the class for players who love to hang back and pick people off from a distance. Perfect for hiding in hard-to-see areas, the Sniper can pick off slow moving classes like the Heavy with ease. The Sniper is also ideal for eliminating an enemy Medic healing a Heavy or Soldier, giving your team a chance to advance.
As for the Sniper's weapons, the Sniper relies primarily upon his Sniper Rifle which charges in strength the longer the Sniper remains zoomed in. Unfortunately, the Sniper has very little close-combat defense because he only sports a weak, but rapid firing Submachine gun and a Kukri. However, the Sniper can earn three unlockable weapons that allow him to have increased functionality. The Huntsman is his Primary replacement and is an excellent mid-range weapon with a quick draw but requires more skill to use in long range accurately. The Razorback is a passive, one-time use item that saves the sniper from one backstab. His other unlockable, Jarate, allows him to throw a jar of urine at an enemy which makes them susceptible to mini-crits and can also extinguish any fire effects from himself or his allies.

http://www.youtube.com/watch?v=829AXrJI6Po

Weapons list:
-Primary
Sniper Rifle
Hunstman (Bow and arrow)
-Secondary
SMG
Jarate (covers anyone in the radius with urine, causing enemies to take more damage, or allies to become unburned)
Razorback (prevents a Spy from backstabbing once, giving the Spy a shock so it takes him longer to attack again)
-Melee
Kukri

Spy
The Spy is the stealth class in Team Fortress 2, using his Cloak and Disguises to blend in and sneak behind enemy lines. A Spy can get behind his foes and silence them in one smooth swipe with the Knife. The Spy cannot use weaponry at all while Cloaked, and will lose any active Disguise if a weapon is used except for the Electro Sapper. In addition to being able to eliminate enemies quickly, the Spy is a great anti-Engineer measure. The Spy can place an Electro Sapper on an Engineer's building, disabling it and slowly draining its Health until it is destroyed. However, the Electro Sapper is easily removed by an Engineer with two swings from his Wrench. A common strategy is to Sap a structure and then immediately Backstab the Engineer. A less common tactic is first stabbing the engineer and then quickly sapping the turret before the turret turns around and shoots the spy.

http://www.youtube.com/watch?v=Fg6PWTz2XBc

Weapons list:
-Primary
Revolver
Ambassador (first shot is as accurate as the Sniper rifle, each consecutive shot is less accurate unless the cooldown is waited out)
-Secondary
Electro Sapper (Is placed on an Engineer's building and destroys it after a short while, does not damage enemies, also once place on a building will cause the building to stop working, but it will work normally once again if an Engineer knocks off the sapper)
-Melee
Knife
-Special
Disguise Kit (Allows the Spy to disguise as either an Ally or Enemy to trick enemies)
-Special 2
Invisibility Watch (allows for 8 second cloak, can be recharged faster by picking up metal/ammo from the ground)
Dead Ringer (allows the Spy to fake die when hit by an enemy attack, the Spy immediately cloaks but only for 8 seconds while a ragdoll takes his place.. cannot cloak unless hit)
Cloak and Dagger (allows a Spy to cloak almost forever, it recharges when the Spy stands still but drains when he moves, if the watch runs out of charge he will shimmer slightly while he moves until he charges his watch again)

All Class information taken from the TF2 Wiki, all videos Copyright Valve.

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