Check these out if you don't already know the well known ones listed. Start from 1 and work your way up.

Penny Arcade (If you don't know what this is read it now.)
[link]
PVP Online (Read it.)
[link]
Chainsaw Suit (Random hilarity)
[link]
Hsu and Chan (Video Games etc.)
[link]
LFG (Wow related.)
[link]
VG Cats (even if he doesnt do anything anymore..)
[link]
Concerned (HL2 comic quite funny)
[link]

I have more but that is just what I have listed on my bookmarks at work. Enjoy. Tell me if you like any. I will be at PAX this year so woo!