I finally released the contributed plugins pack for PyBlosxom 1.3. To be honest, I really wanted to get around to testing everything more, but it's a big project and I never made the time to do it. Rather than sitting on it forever, I decided to release it now. It's vaguely possible that someone out there will download it, discover that the plugins they're interested in are terribly tested, and help fixing the real problem which is that the only testing we do on the PyBlosxom project is anecdotal testing ("well, it works for me...") by setting up some kind of magical testing framework.
More details on the PyBlosxom site.