pk stuff

Just a quick note:

1. Xensource has all the RPMs needed to install Dom0/DomU on CentOS 4.4, including special glibc.
2. Ubuntu LTS does not. And all recipes so far fail to produce satisfactory results.

Conclusion: at least for Dom0, use CentOS, not Ubuntu. This may change over the next few months, but for the time being CentOS is the way to go.