I'd been thinking about changing blogging software for quite a while but decided to wait for MT3.0. Well, we all know what happened there...
My own blog:
I've also got several blogs set up for friends on a few different machines. I'm converting them over too, and the two that are done are loving it:
(yes, they both liked the "Mars" layout from Alex King's site, though Jess has this thing about squid...)
I'm loving WordPress so far! Thanks to everyone who is working on it!