Snafu-Comics isn't bad, a few different artists post different comics...I'm sorta addicted to Bleedman's work, waiting impatiently for the next part of Grim Tales (not due until February at the earliest apparently), but there are some really fucked up ones done by Snafu that are full of lulz...
Mario method of natural male enchancement
1.Pick Mushroom
2.Open Pants
3.Place Mushroom in Pants
4.???
5.CONFIDENCE! (See doctor regarding erections lasting longer than 4 hours).
For any WoW players, I'd recommend
LFG, though non-WoW players can read it and get a good laugh, it's only based in part off WoW, the storyline for it may make some people cringe, and Richard's song "Slaughter Your World" (parody of "Part of your World" from The Little Mermaid) happens to be the guild anthem...
and I gotta agree about XKCD...the two strips that got me into it were the Rule34 strip and
New Pet, though the Bad Movie one that was recently posted gave my friends and I a good chuckle.