Openmelody the fork of Movable Type has announced some days ago the release of its Beta version.

http://openmelody.org/blog/2010/11/melody-10-beta-1-is-here

Actually it may not be considered a real Beta as the Alfa was based on Movable Type 4.32, so it has a lot of background and stability.

The Opinions sub-blog of this site is hosted by Openmelody.

So I am already planning the upgrade.

Check the Openmelod blog for more info.