As a pretty active blogger I am always looking for tools to make it easier to take my show on the road.
Pocket SharpMT is a pretty old Windows Mobile application which I have just become aware of.
The freeware supports WordPress and Movable Type and appears to have a pretty comprehensive feature set. It lacks in the main in not having a WYSIWIG mode for editing blog posts, but in that it is no worse than the official WordPress application for the iPhone for example.
One small not is that the URL to connect to wordpress should be changed from /cg-bin/mt-xmlrpc.cgi to /xmlprc.php.
Download Pocket SharpMT from randyrants here.