Create Many XenServer VMs Quickly

http://virtualfuture.info/2010/10/xenserver-fast-clone-a-vm-120-times-in-90-seconds/

• Create clones quickly
• Start group of clones quickly
• Shut down group of clones quickly
• Delete group of clones quickly

Also, there is a sample sysprep.xml for Windows 7 to fully automate VM preparation.