Everyone reads Dilbert and Garfield. My favourite alternative comics are:
Tales of from the trenches of Columbia Internet. Also features a Dust Puppy, the Elder God Cthulu, and the battle between geeks and marketing.
"A webcomic of romance, sarcasm, math, and language." These are a few good samples: Google maps, Holy Ghost, Boomerang, and Cautionary.
Quantum Tea 
You need to fix the link for userfriendly it is .org not .com
I used to read this all the time but stopped a couple years ago during an ad splash – I think it was giving me too many work flashbacks.
I still have my dust puppy t shirt, maybe I should turn it into a tote or pillow so it gets seen.
Fixed it, thanks!
I love xkcd. When I don’t understand it, I ask my favorite IT guy here at work.