I participate in a several forums pretty regularly, but one I'd gotten away from, and probably shouldn't have, is babycenter. It's amazing how much you can bond over children- this site saved my sanity many times while I was pregnant and after I had my daughter. And now that my husband and I are working on the second one, I think I need to go back.
What other forums do I frequent, you ask? Well, like I said, they're pretty random.
To start, I'm an admin on RX-8 Club. Yes, I have an RX-8- it's now 5 years old, but it was one of the first in the US when they were released back in 2003.
I also participate regularly on The Purse Forum- an excellent group of ladies who have not only fed my addiction, but helped me realize my dreams (I'm so cheesy) of owning Chanel handbags.
And don't forget the World of Warcraft board- talk about an addiction. And speaking of WoW, did I mention the fiasco that was the Blizzon ticket purchasing this year? Yikes! Here's the screen many of us found ourselves looking at most of the day.

Somehow, my darling husband managed to get through, however, and we'll be heading to Anaheim in October for this momentous event!
And on a related note, there's always my guild forum, Draco Dormiens.
So that's where I spend my time now- with the recently re-addded babycenter. Looking forward to it guys!