Little Gamers is one such game
Also mentioned in Microsoft’s Game Developers Conference keynote was that it will let independent developers release their XNA-created games on Xbox Live. The XNA toolkit came out in 2006 but there previously hadn’t been a way for devs to release their work for mass consumption. Seven such games, dubbed Communtiy Games, are already on XBL; they’ll only be downloadable until February 24 and then functional until March 4. So if you want a taste of what’s to come you’d better log on before Sunday.
How much these games will cost in the future, not known.
XNA games only available until March 9 [VideoGamer.com]