I signed up for Movable Type 3.0 beta testing. Haven’t heard from the Trotts since, but I hope to get involved in subsequent stages.
I’ll post a list of MT3.0 beta weblogs here. Feel free to contribute more links that you’ve come across.
Jay Allen’s MT3.0 beta blog
Adam Gessaman’s MT3.0 beta blog
Here’s a list of alpha sites from Kristine’s site.