The Independent Status Report posted on MozillaZine on February 8th has a bit about mozBlog, a "tool to make blogging entry within mozilla using the blogger api".

It sounds like exactly what I want, except that it uses the weak-as-spit Blogger API. (I call it weak-as-spit because the Blogger API doesn't support a title/subject field for items) I'll adapt it to use Conversant's native API for posting to my weblog so that I don't lose the subjects.

Hmm, from the reader comments it sounds like things are quite raw, so I'll hold off for a bit until things improve.