I just found the new Virtual Machine Software released by SUN Microsystems. It’s called VirtualBox.
VirtualBox runs on Windows, Linux, Macintosh and OpenSolaris hosts and supports a large number of Guest Operating systems.
Im running windows XP on my macbook pro and it seems ok, thou OSX is really slow, when I run the virtual machine. (and yes, I install virtual box drivers and tools on the guest)
here is some VirtualBox Goodnes that explains baout the command line tool:
http://dkprojects.wordpress.com/2008/10/29/more-virtualbox-goodness-tackling-the-cli/

