The security release of WordPress 2.8.2 means that WordPress MU also needs to be upgraded, and the new release is available now. However, Donncha O Caoimh also notes that a couple of other bugs has been fixed, including the upgrade notice one.
Author: Thord Daniel Hedengren
Thord Daniel Hedengren is a designer, writer, and blogger, and also the former editor of The Blog Herald. He used to be a hotshot in the gaming industry in Sweden, but sold everything and went International. Most recently he wrote a book called Smashing WordPress: Beyond the Blog, and does loads of kickass design.