I've decided my Atom server prototype written in Python is probably at the stage where it needs some interoperability testing.
You can download a very early alpha at http://jtauber.com/2005/demokritos/demokritos-0.1.0.tgz
Alternatively, if you have a client and want to do some interop testing with me, either email me directly or look for me on #atom at irc.freenode.org.
Some caveats about this version:
The original post was in the categories: python atompub demokritos but I'm still in the process of migrating categories over.