The core developers have announced WordPress Version 2.8.1, which fixes many buggs and improves security of the plugin administration pages, which received a major overhaul with Version 2.8.
An overview of what’s new in this release can be found on the page linked above. A major aspect also is the fix of the automatic upgrade process. It was reported, that if an automatic upgrade to WordPress 2.8 failed, the clean-up process accidentally deleted too many files. Some users seem to have ran into serious problems with this, which reminds us to the ever so important need to have back-ups at hand, when upgrading.
You can get WordPress 2.8.1 here.