Just a quick note to warn all those who maintain a stand-alone WordPress site that there is currently a worm making the most of the security weaknesses in previous versions of WordPress, the main advice is upgrade to 2.8.4 now and save yourself a lot of hassle later as this version is immune to the worm.
A more detailed overview of this security issue and other ways to stay secure can be found here – http://wordpress.org/development/2009/09/keep-wordpress-secure/