Xen is an open source virtualisation product released by the University of Cambridge.
It allows your machines to run multiple independant Linux systems upon one physical host.
This site is designed to collect resources useful to people running Xen upon Debian GNU/Linux, and hosts several pieces of software which can be useful to Xen users:
The Debian Administration website contains several useful articles on using Xen upon Debian.
If you have any questions about running xen-tools please feel free to contact the author.