The MU in WordPress MU stands for multi-user. WordPress MU is an official branch of the enormously popular WordPress blogging software that makes it easy to set up a site that host not one, but thousands of blogs. It's the same open source software that runs WordPress.com, and today it hit a huge milestone with the release of WordPress MU 1.0. It claims to be able to scale to tens of millions of pageviews per day, supports an unlimited number of blogs and users, and has all of the features of its little brother WordPress. WordPress MU really seems ideal for, say, schools that want to provide each of their students with a blog (Harvard uses it) as well as companies and other institutions.

In related news, bbPress, the lightweight open source forum software from the WordPress folks recently reached 0.72, which isn't as big a milestone as MU's 1.0, but it's nice to see that development is continuing apace.

[Via Photo Matt]