hi,
Some of you might have seen the email on the centos-devel list, for the rest I just wanted to point out that we've been working on getting opennebula ( http://www.opennebula.org/ ) rpms and contextualised images for opennebula available with a very low barrier to entry for CentOS.
The 'win' with OpenNebula is that its easy to install, easy to get going, scales well and mostly stays our of your way to let you pick the technologies you want to run your cloud instance.
And the CentOS buildsystem runs on it ( has done for a while now.. )
http://lists.opennebula.org/pipermail/users-opennebula.org/2012-December/021... is a link to the announcement upstream, but feel free to either followup here, on the centos-devel list or on the opennebula-users list.
- KB