Attached is a script I wrote to help me convert from Wordpress to
PyBlosxom.  I hope someone else will find it useful.

Fill in the configuration information, run the script, and you'll have a
directory with the entries and another with the comments.  Wordpress
allows entries to be in multiple categories; this doesn't fit in with
PyBlosxom, so I didn't deal with it at all and entries will need to be
manually re-sorted.  There's a quick shell hack in the comments that
will resort comments when you're done with the entries.

You'll want the linebreaks, pyfilenamemtime, and comments plugins.

As an unrelated question, does anyone have a copy of the tags cloud
plugin?  The link from the website is dead.