WordPress 2.6.3
A minor security fix for WordPress was released yesterday. Basically, there is a low-risk vulnerability in the Snoopy library that is used to display the RSS feeds in the Dashboard. You can download the fix, grab the files manually (wp-includes/class-snoopy.php and wp-includes/version.php) or use Subversion to pull them down thus:
1: svn sw http://svn.automattic.com/wordpress/tags/2.6.3/
It took me longer to log onto my server than actually do the upgrade itself.