I use OS X on a TiBook as my primary machine. When I review software, however, I frequently use Windows. Today, while on a Windows machine I was frantically moving the mouse into the lower left-hand corner to expose my running windows so I could find the one I wanted. Didn't work. :-) That's when you know a feature has taken hold of you. Windley's Enterprise Computing Weblog: Expose and Windows
Comments
There's also TopDesk
There's also TopDesk - www.otakusoftware.com/topdesk.
some clones
http://www.entbloess.com/
http://www.winplosion.com/
http://www.onlinetoolsteam.com/WindowsExposer/
http://usablelabs.com/productWinGlance.html
http://www.oxygen-inc.com/premium/InsaniSoft/iEx.htm (free)
http://taskswitchxp.sourceforge.net/ (free but different)