BabyCenter is good for info just watch out for some of the "opinions" on their boards (which are poorly put together and not pleasing to the eye). You get a lot of, uhm, bad advice there.
iVillage has some but it's also not pleasing to my eye.
If you have a LiveJournal account (which is free) you could join the pregnant community (
http://community.livejournal.com/pregnant). That's what D and I used while pregnant because we're both LJ enthusiasts. Watch out there for some heavy opinion presented as fact. The moderators try to stay on top of blatant rudeness but as it's a heavy trafficked community, it's not always possible.