Argo is now upgraded to CentOS 5.0. There was the usual amount of pain for a server that runs all possible services, but for the most part the upgrade went very well.
So far the only remaining problem is jabberd. I don't have new packages available and the old ones don't start. I guess this is a good time to upgrade to ejabberd.
Feel free to comment if you have problems with the server; or catch me on AIM.