Screen Spanning iMac

Josh has two displays connected to his PC, and they behave like one very large wide screen. When you mouse off the side of one monitor you reappear on the other monitor. This is so cool! I'd much rather add a second monitor for $$ than blow $$$$ to have one very large screen.

Go here for a list of Macs that can Screen Span, and here for the MacWorld article and link to the download.