Virtual Desktops for Win32?

OK, I've been doing this for over a year now and I have yet to ask a question of my own. I feel compelled to now. Since I'm now developing for NT (hack! wheeze!) I'm finding that I quickly run out of screen real-estate (believe me...MSDev is greedy for screen space). I'm wondering what good Virtual Desktop programs there are available for the Win32 platform. I'm sure some of you have suggestions out there. I'm interested in hearing them.