We now have Centos 6 available for our new and existing customers to install if needed. There appear to be no major differences other than newer versions of software, and no problems installing it or gotchas.
You can read the release here http://wiki.centos.org/Manuals/ReleaseNotes/CentOS6.0
If you already have an older VPS and want to reinstall , this video shows you how that can be done.
If you want to copy files off your old image once you have done the reinstall, here is a video tutorial showing you how to do that
Dedicated customers wanting to reinstall will need a full backup, and let us know when is suitable for us to install, pays to contact us at support to help with that.