Questionable Content is
awesome.
Here are some other comics I enjoy that wern't listed:
Ctrl+alt+del - mostly about gaming, great characters
toothpaste for dinner - completely retarded with horrid art, but updated daily.
daily dinosaur comics - every comic has the exact same frames, but different text. pretty odd but I enjoy it.
white ninja comics - very low quality art, but still halarious in a childish manner.
Mac Hall - this one is rarely updated, and sometimes not too funny, but the art is great.
applegeeks - about, you guessed it, macs. great art, similiar to machall.
buttercup festival - one of my favorites, just random sharpie art sometimes. my fanart recently got on there, too.