VirtuaWin
I first started using computer with the Windows OS (like most other people), resisted against the Mac/Apple movement until I finally gave in with OS X 10.5, played around with Ubuntu and other versions of Linux, I now use Fedora at work, and finally settled with Windows 7 because I needed a new PC that was powerful but not as expensive as a Mac.
At any rate, one of the things I missed most about Mac/Linux is that those OS's both have built-in support for workspaces (called "Spaces" in Mac lingo). I did some research and came across VirtuaWin which, despite being pretty ugly appearance-wise, is very functional and performs just the way I want it to.
I've mapped CTRL+ALT+ARROWS to switch between workspaces and WINDOWS+ALT+ARROWS to move windows between workspaces...I admit the last hotkey with the Windows/Super key is pretty random.
Did I mention it's free?
Screenshots.