Our buddy Pete went and wrote up a very detailed post on how to upgrade from WPMU to WordPress 3.0 if you are brave enough right now to try out the beta2. Pete steps through it manually, so be prepared for that. (and backup your site first). These instructions will still be relevant for the final release....

If you have been testing out the beta of WordPress, and are new to the whole concept of multiple sites, you may have noted a lot of the wordpress-mu-specific plugins make reference to the mu-plugins folder. This is not created by default. You must create it in the wp-content folder. The “mu”...

Donncha wrote yesterday that he was rolling WordPress 2.9 into WordPress MU trunk. In Donncha’s post he notes that to use the beta you may want to manually create the commentmeta table for each blog before doing the upgrade. Triple J wrote a quick and dirty plugin for it. I revised it a bit today....

Exciting news here folks, Donncha has just released the next version of WPMU and we have skipped right ahead to 2.8.1. You know the drill – download it, test on a non-production site, and nail down as many bugs as you can to file in trac. There’s some nifty things sneaking in, see if you...