This post is incomplete when wikux.org is in full swing, I’ll do a better job.
Get and install the xen dom0 kernel sources from xensource.com
Install the xen userspace utilities also from xensource.com.
Add xend to startup
Get images from Jailtime.org — they are awesome
Edit the config file to correctly point to the kenel that is in dom0’s /boot
Rock and roll with a xm create command.