Bear with me while I try to get my BBcode familiarity here http://hipsterhitler.com/ - Hipster Hitler is just about the funniest offensive thing I've ever seen. And I love offensive things that do it right.
http://www.mspaintadventures.com - There are a couple of comics on this site, but his most popular (and the one I read) is Homestuck. It combines a video game interface, panels of sound, and animated flash comics, with a storyline that just keeps getting more and more complicated and intruiging. I suggest anyone with time to read Homestuck (as it does take a very long time to catch up). Especially if you love video games, and post-apocalyptic settings.