I've been working in Windows more than usual recently as I push to complete my next book Extrusion Detection. I realized I really missed having multiple virtual desktops, like I do using Fluxbox or generally any UNIX windowing environment.
Enter Virtual Dimension. This is an open source virtual desktop system for Windows. It works flawlessly on my Windows 2000 Professional laptop. At the right you can see the small desktop that appears when you click on a tray icon. I like being able to see small icons representing the applications active on each desktop. For example, desktop 0 is running Firefox, 1 has Adobe Reader, 2 has Putty and Wish (for Sguil), and 3 has Windows Media Player. I don't know how I coped with a single Windows desktop before using this program.