There are many questions that have never been answered as they have been stomped on by newer questions. There are also questions where the user has got an answer but it didn't work for him.
My solution to this is date tags. There would be 5 specific date-tags under the unanswered questions:
I would also enjoy an
unaccepted filter, like we have with unanswered.
We would be able to sort questions out with these tags. It would put an end to all the old unfinished questions.
Of course, we wouldn't sort out the date-tags with normal tags; Instead we could have them lying on the side of a question. However, the main purpose of these tags is to have them on the preview questions page, and so that we can search with them.