Considering how there are tons of fan-created modules, some of which are quite good, there really are countless hours of replay value.
Originally Posted by rui_aiya
If you want a ton more classes (a few new base classes, mostly prestige) that are out of various 3rd ed sourcebooks, check out the Player Resource Consortium at http://nwnprc.netgamers.co.uk/ . They're even adding psionics (a kind of alternate spellcasting that's, well, generally better), although that's still in beta.
I told him once or twice; to stop playin' cards, and shootin' dice.... he's in the jailhouse now