It may be fun to post to the blog from a mobile phone. Doing so via the default web interface is certainly not the most convenient way (lot of extra traffic). WordPress has blog by email solution, which is OK from traffic viewpoint, but I was scared by instructions – involving setup of a “secret email account” and a cron job. Also, it does not support insertion of images.
Scribe is a free Python WordPress publishing client for Symbian S60 phones. Worked fine so far on Nokia E90 – this post is written in Scribe. Insertion of images is still not supported though; seems that the only client capable of it is a commercial Wavelog.