SiteLong story short: Use the XNA toolkit to make a game. Pay the Creators Club fee ($99/yr, $49/3months) and you can develop for the 360. Submit game for a peer review of other CC members to weed out shitty games, copyright violations, or inappropriate content. If you pass, you can sell your game over Xbox Live for 200, 400, or 800 Points ($3,$5,$10 or something like that). You get 70% of the profits.
Thats cool and all, but it sort of illustrates where MS is failing with the PC. With XNA you can make 360 or PC games. Casual games or just "small" indie games in general are HUGE on PC. So where is the PC store to sell this stuff? Nowhere. You could make the argument that PC devs can just sell their games through other sites, which is entirely true. But MS stands to make money by taking their 30% cut, so why not make that option available?
