Mephisto now has an implementation of the MetaWeblog API so you can post articles (like this one) from your favourite Weblog Editor. I've been trying MarsEdit by Ranchero. The API seems to be working ok although when I post a new article it seems to be saved as draft rather than published which kind of defeats the purpose. I'm also not seeing a way to enter an excerpt either.

When you configure your client, you'll need to enter the RPC URL as http://www.yoursite.com/xmlrpc and if it asks for a Blog ID simply enter your user name. At least it worked for me with MarsEdit.

Mephisto is shaping up nicely and its fun to watch it grow through daily SVN updates. Of course things sometimes break, but they get fixed quickly too. Good job Mephisto team!