Many apologies for the length of time that this has taken me to complete.
Overhauled the flavour template finding system allowing people to more easily build, trade, and install "flavour packs"
Added a built-in Atom 1.0 flavour and an RSS 2.0 flavour
New logging system making it easier to track down PyBlosxom issues and plugin issues
Documentation comes in the .tar.gz file, though it's in docbook format
Some other bug fixes here and there
Plugins that work for PyBlosxom 1.2 should continue to work with 1.3.
Overall, I'm pretty happy with it. It's not everything I originally set out to do, but it's a good amount of work for a release. Many many thanks to everyone who helped out.
You can download it from the PyBlosxom website.