Pyrple, the RDF API that I've been hacking on in Python, is now available in 2004-01-26 flavour. The main difference is that it now supports builtins (like CWM) via a builtins module which is quite a nice piece of work.
MySQL support is carefully being hacked in by Deelan, who may well eventually release a database-enabled branch of pyrple.
Pyrple was started as an API that I could use in various applications that require a datastore with query functionality, but it turns out that I've only developed a handful of such applications, so at the moment it's lacking impetus that I can use to develop it further. I still, however, consider it an active project. If you've put it to any use, it may be quite a boost for me to see it in action elsewhere, so do let me know.