I switched Sellout Central to Wordpress a few weeks ago, which was a bit of a rough ride due to the additional challenge I put on myself to not allow myself to break any URLs in the transition. Wordpress is faster and seems to have more features than Movable Type, but also has a lot of "quirks" and, uh, "character" if you want to put it that way. Enough research smooths that out a bit, but it takes a while. Overall I'm pretty happy with it and would like to switch on this site.
The main thing holding me back from that right now is moving the design over. I really don't want to jam this stupid table-based design into the guts of Wordpress and I also really don't want to spend the next six months of my life trying (and failing) to come up with a nice browser-friendly CSS design.