Software - Virtualization - VMWARE

These guys are ingenious! This is a great way to scale your environment not to mention the testing possibilities here.
Free Server: http://www.vmware.com/download/server/
Free Player:http://www.vmware.com/download/player/

Even Pre-Built VMs: http://www.vmware.com/vmtn/appliances/

Free Physical 2 Virtual Tool (including across the wire): http://www.vmware.com/whatsnew/converter.html