Twilight Forums

I've read several on both lists. I'll add...

http://www.megatokyo.com - Not for everyone, but it's entertaining. The art is exceptional too.
http://reallifecomics.com - Great art, interesting and funny comics as well as having a very comic like feel.
http://nuklearpower.com - 8bit Theater. Just. Awesome.

I read Girl Genius, Erfworld, OoTS and xkcd as well! I've at least checked out almost all the rest mentioned in this thread as well, liking some more then other. I recently picked up a new one (to me, it's not new at all) names Unshelved. It's very funny, I read about a year's worth of back comic in the past 2 days. While almost all can stand alone, it does follow a time line so starting at the beginning makes the inside jokes click.

http://www.unshelved.com/

1/0 - Somebody pointed this out to me recently. It's no longer updated, but pretty good. Lots of discussions about the 4th wall.
The rest I read are either already said or not good enough.
Or I've forgotten them.

Untill recently, I'd check the following regurally:
• NatalieDee
• Toothpaste For Dinner
• Married To The Sea
• Real Life Comics
• Dreamland Chronicles
• Penny Arcade
• Gone With The Blastwave

Ran into these today
http://www.simulatedcomicproduct.com/ Reminded me of PBF, but without being so sick
http://www.breaktangents.com was linked to on the above. It's alright