WordPress.com is open to public! And it’s free.
Here’s the tip on how to post pictures to your WordPress.com with BlogJet 1.5/1.6 beta 1: when creating account in BlogJet, select “Movable Type API” instead of “WordPress”.
Provider: Movable Type API
Host: yourname.wordpress.com
Page: /xmlrpc.php
Update: Matt says they opened it for a bit.