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1) depends on thier ages. Yoda in his prime (I'm guessing 500 years of age) would probably have been able to wipe the floor with Anakin. however, with Yoda at age 900, and Anakin at, say, 25....Anakin would probably overpower Yoda.
2) as much as I like the hippie, space pimp would win....er...I mean, as much as I like Qui gon, Mace Windu would simply rip him apart. not much of a contest. Qui Gon had superior force...maybe, but Mace Definitely had more saber skills. in numbers, lets say mace had a 7 in force use, and qui gon MAYBE had a 7.5 or 8. Qui gon's sabery would be around 5 or 6, and Mace Windu's would be around 10.
3) it would be a close one between dooku and maul. Mainly because Dooku would probably be throwing lightning and large blunt objects while Maul only really has high level of saber skills. it would either end up in a tie, with both dead, or one of them would win with massive injuries.
4) Emporer vs Luke. the emporer would win. however, if we're talking a fully trained luke, such as luke from the end of the NJO books, Luke would win. at the point of time of episode 6, Luke was just barely a jedi knight. at the end of the books, he would have been a jedi master on the council (had there been no empire). He would also have been one of the youngest on the council, at age 45.
5) Obi wan in his prime, vs palpatine. I'd say Palpy would win. he may have been a shriveled old man, but he was in a stalemate with yoda....now, if it was yoda and obi wan, they would beat palpatine hands down. but alone, obi wan would simply lack the experience to beat the emporer.
6) Jango would probably kill Han solo in his sleep. or maybe by blowing up the falcon using some well placed explosives....however, in a pistol fight, Han would have a more equal chance. it would depend on the terms of thier fight. one vs one, they would be close....about as close a battle as Dooku vs Maul
7) kinda wondering why leia would fight her mom...but I'd say that Padme would win if it was episode 4 leia vs episode 3 padme. more battle experience for the queen. however, if you were to take NJO leia....leia would win hands down. even without her lightsaber, Leia does get some amount of jedi training, and that would overpower padme's make shift soldier training.
8 ) Chewy would rip jabba apart....granted, he would get slapped around by jabba's freaky tail thing, but for the most part chewy would simply win. unarmed or armed.
9) R2D2 would probably hack a computer to shut doors on chewy until chewy's bones shattered under the pressure. however, in an outdoor brawl...chewy wins.
10) if leia had been trained as much as luke, she would overpower luke. referencing a comic here, but she has more raw force power in her than luke does. without training, she would be a formitable foe, with full knight level training, she would probably kick lukes a**.

Just to let you Know Leia is trained in the force and does have a lightsaber. but she rarely uses it, she leaves most of the Jedi stuff to Luke. except when she absolutely has to. And heres my thoughts:

1. Anikin vs. Yoda: Yoda
2. Mace Windu vs. Quigon Jin: Mace
3. Count Duku vs. Darth Maul: Dooku
4. The Emperor vs. Luke: Palpatine
5. Obi Wan vs. the Emperor: Palpatine
6. Han Solo vs. Jango: Jango
7. Leia vs. Padmae: Padme`
8. Chewbaca vs. Jaba: Chewie
9. R2D2 vs. Chewbaca: Chewie
10. Leia vs. Luke: Luke