-Free and open source desktop and laptop virtualization
-Runs multiple operating systems at the same time on the same PC
-Enables cross-platform, multi-tier applications
-Supports the Solaris OS, OpenSolaris, Windows, Macintosh OS X, and Linux
-Improves efficiency with intuitive blend of platforms and applications
-Provides remote access to guest virtual machines from anywhere
-Supports virtual server environments
-Protects existing hardware investments
A better choice in my point, Free of cost, low machine resources than the VMware, 2 minutes installation, quick wizard to guest OS.
YES! VMware is big one. but now I prefer to use xVM Virtual Box, it also does ever thing we need. as I have just tested it with Vista and Ubuntu as guest OS.
did you guys use VMware? if so then try xVM Virtual Box now. and write opinions.