Intelligent online cartoons:

• xkcd. yes everyone already knows about this one. IPv4 space (notice how apple has as much space as all of japan? trust me they don't need it). how pure is your scientific discipline? frequently a bit ... odd.
• Basic Instructions. How to make a good impression at a job interview. How to converse with someone you don't want to talk to. Scott Adams experimented with him in turning it into a print cartoon but it just wouldn't fit into the restricted size.
• Savage Chickens. Peace and wisdom. Dachshund. My most recent discovery.

There's plenty of crap out there. Can you add any other good ones?