HALO Waypoint
Provides users with various kinds of Halo information, including information on members of the Halo community, various machinima videos and gameplay strategies and tutorials. It also allows players to access their own gameplay-related data, tracking "milestones" and progress through multiple games in the series.
Bungie.net
For all your Bungie related news and weekly updates.
Rooster Teeth Productions
Home of the
"Red vs. Blue" machinima series and other hilarious shorts and comics as well.
Machinima.com
For all your other Halo related machinima, other machinima, and home to "Inside Gaming" hosted by the Dead Pixel, everyday except Sundays. Be sure to check them out for the latest new and possibly win some free stuff. Everyone likes free stuff.
Machinima Respawn-A sub-channel from Machinima.com's Youtube channel focusing primarily on FPS titles, shooters in general, and fighting games. Tuesdays they do LIVE Streams where special guests from the Machinima crew and celebrities such as Michael Jai White(star of the new live action series on Machinima.com "Mortal Kombat Legacy"
wink join them and chat.