A wonderful online comic

Here are a few to whet your whistle.  (The mouseover texts are equally hilarious.)

http://xkcd.com/503/
http://xkcd.com/337/
http://xkcd.com/425/
http://xkcd.com/100/
http://xkcd.com/171/
http://xkcd.com/409/
http://xkcd.com/627/
http://xkcd.com/149/ (My favorite)