For you PC types out there, it's also compatible with Windows 2000/XP (and I presume 2003 Server).
Why would any of the PC types need one of these, for that price we've been able to get much better mice for a while:
http://www.bestbuy.com/site/olspage.jsp?skuId=7105919&type=product&productCategoryId=pcmcat23200050023&id=1109233585993
OH BOY! a multi-button mouse for my PC! These Apple people are so smart.
To get the same thing as the scrollbar on a PC, you just press the wheel and side the mouse in the direction you want to go.