The XBox is no playground, I think to be allowed to develop for it you need to be pre-approved and throw millions of $ in the ring. I haven't checked, though.
The XNA Framework provides support for both 2D and 3D game creation and allows use of the Xbox 360 controllers and vibrations. XNA framework games that target the Xbox platform can currently only be distributed to members of the Microsoft XNA Creator's Club which carries a $99/year subscription fee.[1] Desktop applications can be distributed free of charge under Microsoft's current licensing.
Edit: Xbox 360 games written in XNA Game Studio can be submitted to the Creators Club community[15] for peer review. Other Premium Creators will perform a peer review of the title. Creators can set a a price point – between 200 and 800 Points – that Xbox 360 owner can then choose to pay to download. The game is listed on Xbox LIVE Marketplace, the programmer will get an electronic payment every quarter. If the title sells exceptionally, it may be featured in advertisment on Xbox 360 and other Microsoft online properties.[2]
