What the hell happened with these boards early this morning?!?! Why the hell are they telling us to change our passwords?!?!? Hack attack?
[Moderator Hat ON]
That announcement has been there for quite some time. 
A hacker got in and fiddled around with some stuff and may have had access to member passwords at some point. The hole has been plugged, but you should change your password to be safe. Go to About the Message Board and read the “Boards hacked?” thread for more details.
[Moderator Hat OFF]