XNA Games on Xbox
XNA is a framework and development studio created by Microsoft to help create games for Windows & Xbox (for anyone from hobbyist to independent game shop).Number of cool communities springing up around XNA games with lots of help and game examples.
Take a look at the XNA Creators Club and some of their XBox Games created by their contributors.
XNA Site, XNA FAQ, XNA team blog here
Game Development forums on MSDN here
