Taking the risk of crossposting, I would like to express a main blocker to me for using Stack Overflow (besides that I really think SO is awesome!):
Sorting by unanswered questions also returns questions, which were simply abandoned/not closed/not moderated yet, etc.
I think there must be a way to distinguish that in order to get results of 'really' unanswered questions.
I would love to see a possibility to mark the abandoned items in a way they stay out of the unanswered results.
F.e. allow personal tagging for SO-users and custom creation of result lists (trac-like) would be lovely, than I could create a list 'show all unanswered questions, but not the ones I personal-tagged as crap'.
Can you (the responsible people who can decide about features) let me know, if you are planning something like that or if there are other approaches to get sharper results?