I haven't actually read any comics in ages, but I used to go to these sites quite religiously:

www.crfh.net MWF
www.leasticoulddo.com M-Sa
www.bobandgeorge.com Daily
www.aliendice.com M-F
www.somethingpositive.net Daily
www.megatokyo.com MWF
www.reallifecomics.com M-F...kinda
www.nuklearpower.com TThSa
www.sinfest.net Daily
www.9thelsewhere.com Once Monthly
www.machall.com (Don't remember...)
www.penny-arcade.com MWF
www.go-girly.com (Don't remember...)
www.manatheater.com TTh

Yeah...