Your systems may already have picked it up, but if you haven't noticed, CentOS 5.5 has been released. You can find more information in the RHEL 5.5 release announcement.
Additionally, the CentOS community compiles its own list of interesting tidbits in the CentOS 5.5 release notes, which is an interesting read as well. The CentOS 5.5 LiveCD is released at the same time and has a its own release notes in the wiki.
I am being fed up with the state of our RPMforge infrastructure lately. The RPMrepo website is down, and the RPMforge wiki is hosted there. This is a theme recurring every XX months. I myself neglected the infrastructure (as long as the repositories work!), simply because I lack the time to maintain it.
But since it is becoming a liability and we have more people involved, I want to fix this once and for all, I am looking for a few donated managed servers that we can set up so a single glitch does not rip out some of our infrastructure.