I’ve been waiting for something like this for a long time now, as I’m sure many others have.

Xbox Live Community Games is as exactly as it sounds, games created by the community for release on Xbox Live. Using a creator identity (much like gamertags), anybody can submit in their created games. After creating the game and writing a description for it, the game is submitted for Peer Review, to make sure no copyrights have been violated and to make sure it is appropriate for release. After a game has been approved, it is released to the Xbox Live community for download. Those who create good games will have their reputation increased by fellow gamers, probably similar to the system that is already in place for online gaming. As of this moment, a few of the games have trial demos up on the Xbox Live Marketplace. Games will hopefully be free, but nothing is confirmed as of now.