Are you by chance referring to DM of the Rings [http://tvtropes.org/pmwiki/pmwiki.php/Webcomic/DMOfTheRings?from=Main.DMOfTheRings]? If so, I would doubly recommend it.likalaruku said:that LotR comic Shamus made a few years ago.
As for personal favorite, hands down The Order of the Stick. [http://tvtropes.org/pmwiki/pmwiki.php/Webcomic/TheOrderOfTheStick?from=Main.OrderOfTheStick] A mix of excellent characterization, witty humor, and fitting filler makes for an enjoyable experiance. The beginning only really works if you're a D&D fan (though not being one myself, I can't say for sure) but transitions really well when the drama starts to come. FYI, it clocks in at over 700 strips, each one usually a page long. Hope you've got some spare time