Is any one planning to try it out? I mean any of the die hard WP guys? If you are a WP fan and you're planning to install a test of MTOS, I'd like to hear about your experience.

One thing I'm considering is a multi-blog/multi-author installation. I've always resisted using WPMU because the WP updates always lag in the MU version so you end up with code that has compromises published while you wait for an update. But with MT the MB/MA support is built into the core code.

http://www.movabletype.org/2007/12/movabletypeopen_source.html
http://www.movabletype.org/opensource/