Dominic Deegan: Oracle for Hire http://www.dominic-deegan.com
Sinfest http://www.sinfest.net
Ctrl-Alt-Del http://www.ctrlaltdel-online.com/
-?- http://www.ashfieldonline.com/ (retired, unless something has changed)
Chopping Block http://www.choppingblock.org
Funny Farm Comics http://www.funnyfarmcomics.com/
General Protection Fault http://www.gpf-comics.com/
Help Desk http://www.ubersoft.net/
8-bit Theatre http://www.nuklearpower.com/latest.php
Real Life Comics http://www.reallifecomics.com
Penny Arcade http://www.penny-arcade.com/view.php3
User Friendly http://www.userfriendly.org
Ozy and Millie http://www.ozyandmillie.org
A Modest Destiny http://www.squidi.net/index.php
El Goonish Shive http://www.elgoonishshive.com/
Never Never http://www.mopsy.com/ (semi-retired)
Adventurers http://www.adventurers-comic.com/
Antihero for Hire http://antiheroforhire.com/
Count your Sheep http://www.countyoursheep.com/
Filthy Lies http://www.filthylies.net/
To be added: Order of the Stick, PhD comics, MacHall, Friendly Hostility
Queen of Wands http://www.queenofwands.net/
Men In Hats http://www.meninhats.com/
Elf Only Inn http://www.elfonlyinn.net/ (retired?)
Dragon Warrior Comics http://www.dragon-warrior.com/ (semi-retired)
RPG World http://www.rpgworldcomic.com/
X-E http://www.x-entertainment.com
I-Mockery http://www.i-mockery.com/default.php
Homestar Runner http://www.homestarrunner.com
Fark http://www.fark.com
Something Awful http://www.somethingawful.com
(Looks to be broken right now)