WordPress 2.6 is now available.
Check out the announcement post and the screencast showing a few of the new features. Post revisions in particular are going to be really helpful for multi author blogs.
http://wordpress.org/development/2008/07/wordpress-26-tyner/
Raanan Bar-Cohen 
Just watched the screencast, looks very nice indeed. Congratulations on all the enhancements, and hope that the launch goes well for you!