AltDesk Virtual Desktop Manager for Windows

AltDesk: another must-have for Windows users, especially on laptops. It's clean, elegant, and does just what you would expect at every turn. Arguably as nice or nicer than the Macintosh windows manager thing (though it doesn't slide the windows in and out - too bad). I set it so that it's nearly transparent when not in use, so it's wonderfully non-obtrusive, yet springs to life when I need it.