I go to fertilityfriend.com. It's a paid membership, which I think keeps a lot of trolls out. There's great information and a lot of support, very little to no drama, which is kinda nice. I found it wheh I was TTC, tons of info on fertility treatments, but their pg boards are great too.
babyzone.com. It's not quite as active as here, but enough to keep it somewhat interesting. One perk, is that drama over there is extremely rare, and their debate board is good... intelligent debate without it turning ugly.
Re: Other pregnancy/baby message boards?