I sometimes read old questions in unanswered list to see if there're missing ones I can help. But a frequent situation is many questions has been answered perfectly while the OP doesn't accept as an answer. I'm sure about this because OP commented on answer with "Wow", "Great", "Thank you very much" etc. It is usually seen in groups of new or inactive users. The same phenomenon occurs on those whose answer is rather easy and simple as well as duplicated so that problems have been solved in comment, even not necessary for a formal answer. I wish some ways to put out these kinds of questions in unanswered list.
Not to leave this question unanswered...
- The SE definition of "answered" is the presence of an answer that is either accepted or has positive score. This is explained in Jeff Atwood's post OK, Now Define “Answered”. Thus, in many cases a single click of upvote arrow will put the question out of the unanswered list. There's a query that brings you questions with answers in need of votes, filtered by tag.
- In (rare) cases where a correct answer has negative score, you may be able to change it to positive with help of Crusaders.
- If an answer is hiding in comments, you can ask the comment author to re-post; failing that, post an answer yourself (possibly as community wiki). The Crusaders may help the answer get positive score.
- Further reading: http://meta.math.stackexchange.com/q/9877/, http://meta.math.stackexchange.com/q/8583/
- Last but not least... congratulations/condolences on becoming the 14th Unsung Hero of Math.SE. Votes are scarce around here. (http://meta.math.stackexchange.com/q/11640/)