Here are some webcomics who I admire and love:
Player vs Player
Sheldon
Bug Comic
Edmund Finney’s Quest to Find the Meaning of Life
Zombie Roomie
Agent-X comics
Calamities of Nature
Cock & Bull
Ctrl+Alt+Del
Do you know Flo? (Dutch)
John & John
Legend of Bill
Misery Loves Sherman
Ollie & Quentin
Optipess
Penny Arcade
Pinkerton
Robot Beach
Savage Chickens
Chuck & Beans
Sin Titulo
Starcrossed
Tales of a Checkered Man
That Deaf Guy
The Abominable Charles Christopher
Toonhole
Virtual Shackles
Wulffmorgenthaler
xkcd
Zorphbert and Fred