So far, the best application I’ve found for blogging (read: “editing a Movable Type blog”) is Ecto

From the Website:

“ecto is a feature-rich desktop blogging client for MacOSX and Windows, supporting a wide range of weblog systems, such as TypePad, MovableType, WordPress, Drupal, Nucleus, Blogger, and more. ecto is the successor of the wildly popular Kung-Log, which has been in use by thousands of Mac users and which earned a 4.5 mice in the MacWorld July 2003 issue. ecto earned high ratings at VersionTracker.com, and a MacUpdate.com.”

Other applications I’ve tried include:

EspressoBlog (no longer being developed; author may or may not be working on a new application called “UserSpace.”)

Frequency: For whatever reason, this app didn’t seem to work as well as ecto.

Archipelago: This application doesn’t look to be in current development.