Quote - Over at the Straight Dope Message Board (where I have spent many an unproductive hour) they have this rule. Moderators will sometimes even change the title and leave the note, "Title changed to be more descriptive."

The mods on the modo forums do it too, they put a descriptive title in square brackets after the vague "I have a question" type title. They also sometimes put 'solved' in square brackets after the title which makes the thread more useful when it comes up in a search.