Our designer was fixing some bugs, and we think an anti-spam protection mechanism got unplugged by accident. Our forums were hit by a giant wave of naked advertising. Sadly, none of these ads were in stereoscopic 3D, so we are nearly 100% sure that it was SPAM!
So, you may find the forums going up and down while we locate the problem. Sorry for the inconvenience!
EDIT: Forums are up. Let us know of any problems.