Megatokyo
Completely nerdish, with a hint of otaku fanboyism. Do not even click if you're still under the impression that even though you post on a Star Wars forum, you're still a total badass.
Ctrl+Alt+Del
A lot like PvP and Penny Arcade. A web comic completely for gamers. Many funny moments, Ethan is the man, and Zeke is even better.
Penny Arcade
This is the fucking legend baby. If you're into web comics, or you're into video games, and you do not have this in your favorites list, you should shut down your computer right now.
Heroes of WoW
A pretty new, seldomly updated, webcomic based in the World of Warcraft universe. Most of it is inside jokes that you need to have the game to get, but some is universal, and all of it is funny.
Applegeeks
Ren would joygasm if he read any of these. Fortunately, I know chances of him actually being around to read this thread are slim to none, so I won't have to bear the digust of giving him the sick pleasure. Still, some funny shit. Makes me want a Mac.
The Last Days of Foxhound
If you're a fan of the Metal Gear series, you'll totally dig this web comic. If you're not, don't bother. Its all inside jokes, and the art is really shitty, but if you have played the games its fucking hilarious.
8-bit Theater
I haven't been to this one in like a half a year, so I'm way behind. Hell, I wasn't even close to being up to date when I last read it. This is one of those comics where someone with absolutely no talent photoshopped around the graphics from some famous video game (in this case, the original Final Fantasy), and called it art. Fortunately, this guy is actually funny, so it makes up for the lack of originality.
The Perry Bible Fellowship
Some of its sick. Some of its weird.
All of it is funny. One of the best comic series I've ever had the pleasure of reading. Requires no knowledge of anything to get it, and you
will get it.