In Beta
Well the site is now in Beta.
For the time being no new features will be added to the system and the only code changes will be to fix problems or to implement high profile security fixes to the WordPress MU code base.
The forums have details on the basic use/configuration of the additional features in the blogs but the best way to find out how they work is to play around with them. If you find something that you feel others would like to know about then please add a post to the relevant area in the forums
