Tonight I was able to get ejabberd up and running on Argo. I had to use the Fedora 7 package for now until I work out co-maintainership on the ejabberd package in EPEL, but it seems to be running fine.
I imported all the "major" domains - nivek.ws, pyxos.net, silfreed.net, and thtech.net. What I didn't import were some "legacy" jabberd.blah.net domains. I'm not sure if anyone was using these, but my guess is that they weren't. If you were or knew someone that was, please let me know and we'll figure something out.
At any rate, ejabberd seems to be working fine. We'll really get a test next week when people on other servers log in and I can see if s2s works properly.