VMWare - Great, love the automatic change of screen resolution when maximizing/changing window size of the Virtual Machine
VirtualBox - Very lightweight, don't use it because of the changing screen resolution feature of VMWare
Microsoft Virtual PC - Not a fan at all.
Sorry, never used those two but I'll check em out.
wait a minute.... i don't think we are talking about the same thing. I don't know what it actually is called, but i'm talking about the feature that you can have virtual desktops... like you can on Linux. OS X calls it Spaces.
and i've been playing with both on a VM and I must say that WindowsPager is AWESOME! So light, so nice! It works like the linux one does and the config is just a text file. Loving it!