I currently have Suse 10.1 installed on an AMD 3500+ machine with 2 gig of memory. I installed the now free VMware server and am running Windows 2000 with sound, DVD, USB (still need to play with this though), and all the multimedia capabilities working. It works very well. You wouldn't know you are running Windows on a virtual machine. I also have two copies of Windows 2003 Server installed and run them simultaneously for some classes I am taking. I would encourage anybody wanting to run virutal machines to try downloading VMware's server. It is free and easy to install.
Go to www.vmware.com
and click on the 'products/free products' link.
If anybody needs help setting up a virtual machine or installing the server, just place a post here.