This again... I only read online comics with the exception of Dilbert and Get Fuzzy
All of these can be found at
www.keenspot.com
Wendy
Sinfest
Real Life
Gene Catlow
Exploitation now (Its over though)
RPG World
8-Bit comic -
www.nuklearpower.com
megatokyo -
www.megatokyo.com
MacHall -
www.machall.com
Some funny yet more adult oriented comics are
Sexy Losers -
www.sexylosers.com
T. A. Vision - tav.keenspace.com
Well thats most of them