What question hasnt been answered?

Many questions haven't been answered yet... including this one up to about 10 seconds ago. :) It would be impossible to list them all, since there are so many, and the list is constantly changing.

If you want to find unanswered questions in general though, that is really easy. Just go to any category, and find the "All unanswered questions" link. That will list out all the unanswered questions for you, and you can start answering them. What fun, eh?