I haven't really played with a client app for posting to a blog in a few years. The web interface for WordPress is pretty darned good now. But MarsEdit 3 just came out, with rich text editing. That might be pretty cool... Does it handle media?
Looks like it might. And it integrates with my Flickr account, too.
Pretty slick. It handles media uploads, categories, tags, pages and posts. I just might have to pick up a license...