Ok I now have a Xen box hosting multiple linux distro vm's:
SUSE pro
SUSE enterprise server
Fedora Core
Red Hat Enterprise
Cent OS
I plan on creating all rpms for all of the above distros as well as testing the install script/installer I may include mandrake if I see a call to support that distro
I can add a vm for the following distros, however I'm not familiar with creating packages.
Debian
Gentoo
Slackware
{free,open,net}BSD
if anyone is interested in developing packages for these distros, please contact me mailto:derek@gurulabs.com and I'll spool a vm and give you access
derek