Hmmm...I guess another way to stop getting e-mail notifications after the fact would be to just "unwatch" the thread, right? Although I sometimes feel that if I start a thread I shouldn't *abandon* it.
It would be neat if the system could change the question mark icon to some kind of a Happy Camper icon once the OP is answered satisfactorily. Maybe the big grin smiley?
Or the thumbs-up?