Foxit Reader

It's another good program you guys should try out, especially if you've ever gotten tired of Adobe's crap. It load's quickly, works flawlessly, and almost makes up for the inherent flaws in the PDF format with lots of tools to edit and view a document pretty much however you like. Plus it's got a clean interface, which is always a plus when viewing any kind of media files, as much as Vista and other modern shiny-mongers might have you think otherwise.