The most recent "annonymous" post i found was in February of this year, i really think its a good idea to not have them, that way you know who posted what and if its something "of questionable nature" the moderators know who to blast
i've also noticed that recently the number of posts have come down some from what they were but i'm not worried about it, with consistantly 200+ people "browsing this forum" i don't think its in any danger