VMware Virtual Appliances Repository

VMware provides a product called VMware Server for free, that allows you to virtualize pretty much anything. Very good product and highly recommended. The company just happens to have its roots in Linux from the start too.
One of their additions to the VMware Technology Network is the Virtual Appliances repository. Here you can download any number of free appliances from the latest linux install of OpenSuse to a Jabber server appliance installation. Very nice list of things to virtualize if you have the hardware to support it.