If you don't mind me asking what happened to it? Facebook now reports about 5,500 monthly users. I'm guessing you were acquired by SGN but I'm don't see why that would cause traffic to drop so much.
SGN switched their core focus from Facebook games to iPhone games in mid 2008. At that time, they droped support for all of their Facebook properties except (fluff)Friends. Games on the Facebook platform are doomed to rapid traffic loss without constant adaptation and viral tuning. Even with it, user retention is hard.