Another WordPress version is now available. This version (2.5.1) includes more over 70 bugs fixed (you can see the list here).

Some features:

• Performance improvements for the Dashboard, Write Post, and Edit Comments pages.
• Better performance for those who have many categories
• Media Uploader fixes
• An upgrade to TinyMCE 3.0.7
• Widget Administration fixes
• Various usability improvements
• Layout fixes for IE

Download update here
More information at the WordPress official site.