Version 2.5.1 of WordPress is now available. It includes a number of bug fixes, performance enhancements, and one very important security fix. We recommend everyone update immediately, particularly if your blog has open registration. The vulnerability is not public but it will be shortly.

In addition to the security fix, 2.5.1 contains many bug fixes. If you are interested only in the security fixes, you can download these corrected copies of wp-includes/pluggable.php, wp-admin/includes/media.php, and wp-admin/media.php. Replace your existing copies of these files with these new copies.

If you download the entire 2.5.1 release, you will be getting over 70 other fixes. 2.5.1 focuses on fixing the most annoying bugs and improving performance. Here are some highlights:

• 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