I used to read PA, PVP, Ctrl+Alt+Del, 8-Bit Theater, Sexy Losers, OldSkooled, Instant Classic, Dudley's Dungeon, VG Cats, white ninja and Little Gamers.
Eventually I stopped, and now only read PA all the time (since it's small). I occasionally check out Sexy Losers and white ninja, too.
After a while, though, I started caring about the humour per comic ratio and CAD loses on that account, due to its occasional lame jokes and plot-heavy segments. You'll probably like it, though.
i read 10 hours non-stop of megatokyo once... same for 8-bit-theatre.. also for the webfiction John Dies At The End and the one from somethingawful.com (i think it was called 'untitled document')
oh. also white ninja (the brain one is class )
i tend not to go back to them though... i spend a whole night reading 2 or 3 years worth of content, then none since... i guess it's just the way i work with those things...