Two readers (thanks, Ricardo and Ken) pointed us to a story on digg that appeared this morning.  The story links to a posting on a German board about a potential phpBB hack attack coming in the next few weeks:

http://www.issociate.de/board/post/312809/phpBB_mass-hack_being_prepared_

"During the last few days a bot using a name FuntKlakow, has been registering to maybe thousands of phpBB forums. Some speculate that the bot's owners are preparing to exploit an unreported vulnerability."

We might be chasing a ghost here but it's always good to be on the lookout for something like this.