Qumana
I just finished getting all set up and happy with BlogJet, and someone (the author?) posted a comment here about Qumana . It's very similar to BlogJet, with the same nice editing experience that made BlogJet such a pleasure to use.. but it's free.
It's called Qumana LE, which makes me think there's a commercial version coming.. but for now it looks like a good free tool.