You might want to look at this comment system using Pump.io, for Pelican =)

(The author is wrong about Pump being 'microblogging' though :p)

The sad part is that the 'plugin' doesn't actually use the title field in Pump, I think. Room for improvement ;)

EDIT: I saw this in the source code:

““# TODO post notices to public””

Posting non-public is a bad idea... but apparently it does post to public, it's just an outdated comment.