Check out the latest from Microsoft Hardware - the Microsoft Touch Mouse, specifically designed for Windows 7 and very cool. 

First link below is the press release, second link is the demo.  Be sure to watch the demo!

http://www.microsoft.com/Presspass/press/2011/jan11/01-05TouchMousePR.mspx

http://www.youtube.com/watch?v=sVsFcKd6NjU