Wordpress 2.5.1 was just released and includes over 70 security fixes. Visit the download page to get it, because it improves security and it’s very important for your blog.

Here is some of what they improved:

• 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