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Game Developers
Here is a list of game developers and publishers working on the Xbox.
Makegames.com:
Makegames.com gives you a more general overview of game development, but also does a good job of explaining what game development is really like.
GDSE - The Game Programming and Design Search Engine
The Game Development Search Engine has links to thousands of websites that feature information to help you in every aspect of game development and design.
GameDev.net
GameDev.net is a great resource for learning the ins and outs of game development. They review programming books, post new job listings, and try their best to give you all of the information you need if you want a job as a game developer. Great site with tons of interesting content.