Sinfest, QC, Penny&Aggie, Wapsi Square, Evil,Inc, Menage a 3, diesel sweeties & Nothing Nice To Say get my highest devotion. Scene language, RPG world, OrneryBoy, CoffeeAchievers, NoPinkPonies, cool cat studio & PlatinumGrit used to get the good lovin before they either went TU or turned into non-free sites. Scene Language was sorta close in tone to QC. Coffee achievers less so.
Next tier below the gods is the A-list: lackadaisycats, irregular webcomic, scary go round, overcompensating, wigu, sequential art, stuff sucks, shortpacked, D&D, sam & fuzzy and the most eleet venerable of them all, Kevin & Kell. Token mention for Penny Arcade too, local boys done good. Occasionally I go do the satisfying-archive-slog and visit : hero by night, gunnerkrigg court, hatesong, striptease, a softer world, misfile, sidekick girl, friendlyhostility, stuck, pewfell, dorkboy, or Badguyhigh.
Best way to add to the list? Check links and twitters of artists I already like. Try em out.
Prolly miss RPG World most, - Ian may not have been the one to break my webcomic cherry, but he sure was damn funny ...