Conventional wisdom is that you can't use a mouse on the Xbox 360 (you can use a keyboard though). XNA Game Studio claims not to support it for example. (has anyone tested it? I should probably ask on stackoverflow)
However, this support page claims that "Most USB mouse devices and USB keyboards" ... "are compatible with the Xbox 360".
Also, the Microsoft Wired Desktop 600 Keyboard & Mouse page claims
- Great for Gaming - Xbox 360 Compatibility
Perfect for texting and accessing playlists.
Is this for real? Will the mouse do anything when plugged into the 360?