I picked up a Logitech MX Revolution over the weekend. Now all other mice are garbage.
This thing has a two stage mouse wheel... spin it slow and it clicks like a normal wheel... give it a quick spin and the think kicks over into freewheel mode allowing you to blaze scroll through documents. Getting back to the top of a page was never so easy!
Plus the think is ultra smooth, and the maybe the most comfortable mouse I've ever used. It's the best $100 I ever spent on a mouse (that IGT will be reimbursing me for).
http://www.logitech.com/index.cfm/pr...volution_mxupp