I just added full blog editor support to thumblogger:
http://www.thumblogger.com/blogapi/newindex.html

With a blog editor you can manage blog posts from all your blogs with one program, really handy! :) But the really handy thing of those blog editors is that when you include a image in your blog post the editor uploads it automatically to your server.

Free ones:

Qumana
http://www.qumana.com/
Free

w.bloggar
http://wbloggar.com/
Free

Need to pay:

BlogJet
http://www.blogjet.com/
$ 39, trail version available

ecto
http://ecto.kung-foo.tv/
$ 17,95, trail version available

I especially like the simpleness of BlogJet, shame it is not free, but still a nice program if you can invest something.
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