I had forgot to mention DesktopManager, a virtual desktop application for Mac OS X. (This MacSlash thread reminded me to mention it.) It’s much closer to what I want in virtual desktops than Space.app, which hasn’t been updated for quite a while, and while I hear CodeTek’s VirtualDesktop is very nice, I can’t justify buying a copy for each of the 3 Mac OS X machines I regularly use…
If you think it’s a worthwhile project, consider making a donation. The money will go to the developer’s girlfriend, which for some reason, I find highly amusing…