Blogging systems
I still have no beef with Movable Type.
However, I AM testing ExpressionEngine and it's pretty deep. How deep? Well, when you can add arbitrary fields to member profiles (call them authors if you like) and post records, use them in your templates as simply as {fieldname} and embed SQL in your templates, that's pretty damn flexible. There's a MovableType plugin that lets you embed SQL in custom tags, but ExpressionEngine comes with this feature out of the box. Admittedly that's probably not that big a deal for someone who's embedding SQL in a page; the big deal is the ability to add fields and just USE them. I have that capability in the link forum software I mentioned some time ago, and it's potent enough that I could use it for blogging or as a BBS systems.
And on the Wordpress front, Jennifer at ScriptyGoddess is converting because she likes it as a development target. Being open source and written in PHP (SG's apparent preferred language), Wordpress can directly absorb her stuff. If much more talent of her caliber starts working in Wordpress, it's going to become really impressive really fast.In fact, I just peeked and found they've released version 1.2 and it already looks impressive.