The best I can think of:

*Order of the Stick
Questionable Content
Crap I Drew on My Lunch Break
Bunny
Fuzzy Knights
*Boy on a Stick and Slither
**Return to Sender

Asterisked ones are the absolute best. As in, I keep checking them even if there isn't supposed to be an update. In the case of Return to Sender, it hasn't updated for almost a year, but I still check it daily (Definitely worth a read)

Edited to add links, and to say Dilbert is good too. Also, I anti vote ctrl-alt-del