I am not sure who would attack the forum. I didn't even know that happened, was it over Shabbat? Maybe they do it when they know the admins wont be able to log in due to observing Shabbat.
It it was anons, the thing to consider is that they have no actual membership. They just post messages telling other anons to hack the target they are trying to take down. Then several start doing the DOS attacks until "tango down", they post about it, usually offering a screenshot of their hacked site. They would hack in and take all of your emails and post them publicly. If you use the same email that you use to log into this forum, and you use it on other social networking sites (like Facebook) then they could post that publicly- doxing you for all of them to see. Exposing your Facebook profile (with picture- possibly hacking that too) and post as much information they can get from that one email. They would post it on Twitter and RIC Chats. Typical anon work. Twitter is where they recruit people for hacks because it's the quickest most public way to enlist hackers against a target.
Has that actually happened? Not that I have seen. So maybe it was not the Anonymous collective. A simple search on Twittter would reveal if they did attack the forum. Maybe check on AnonymousIRC or AnonOps to see if they did attack us.
As a precaution, I would urge EVERY member here to change your email addresses to one that you use only for this forum and not other sites.