A webcomic of romance, sarcasm, math, and language.xkcd is a webcomic created by Randall Munroe, former NASA roboticist and programmer. Thus the subject matter you can expect to find in it is pretty 'nerdy'.
Strips vary from science and programming in-jokes, jabs at pop culture or just thoughts about love and life. Sometimes they're really awesome
charts or most recently
this click and drag.
It's a really great webcomic and choosing just one strip for this post almost killed me.