This short guide explains how you can build virt-df, virt-top, virt-mem and virt-ctrl from the sources on a Debian Lenny system. These tools are currently available for Fedora in binary format. More here
virt-top – “top”-like utility for showing stats of virtualized domains.
virt-df – “df” for virtual guests. Run this on the host/dom0 to find out how much disk space is used and available on all partitions of all the guests.
virt-mem are tools for monitoring virtual guest load, kernel messages, process lists and so on without needing to log in to the guest itself.
virt-ctrl is a graphical management app for virtual machines, modelled after Virtual Machine Manager.