In reference to this question, this person asked a question and later in the comments says nevermind because he/she found a mistake and is no longer stuck. So as someone combing through the unanswered questions, I'd prefer that the owner delete the question so it doesn't pop up in my search for unanswered questions. Also the thought does come to mind that if the owner's comment means he/she won't act on it even though somebody does come up with an answer in the future, then why bother with it if you can't get any points off of it? But that's not my primary motivation!!! No, no, no...
On the other hand if that's bad SO etiquette (and I'm already feeling a little guilty admitting the last statement) then I'd at least leave an answer with some general debugging tips for the next poor soul with a similar question and happens to run across this question. Had the same thing happen to me before so I know the feeling when you run across an old, stale, and unanswered question that's exactly what you want to ask.
Or maybe I should just flag it for the moderator and let them deal with it...
So what does SO etiquette say is the prefered course of action?