We've just had someone who had signed up as a user by the name of Bigeloww post a message to this board that contained an apparently innocuous, though off-topic, link. If you clicked on it, it would take you to a webpage that would attempt to install a virus on your machine. I've deleted the message, but deleting the user will have to wait for Sir Toby (whom I've alerted via email). It's possible that further such messages may be posted, so please be alert and don't click on any links that you aren't sure are kosher. It would also be a good idea to ensure that your machine's virus checker is up to date. (I use AVG Free.)
I'd have made this an Announcement, for maximum visibility, but only Sir Toby can currently post those.