When I scan the front page of Stack Overflow, I habitually look for non-green boxes for opportunities to answer questions. Would it be helpful to differentiate between questions that have answers with at least one upvote, and questions that have answers, but none of those answers have an upvote? I know for myself, I'd like to style my answered-novotes similarly to the unanswered CSS style, so that I'm more likely to consider those questions as needing help. Thoughts?
EDIT: Super User has a similar non-boxed style for questions with answers but no accepted answers. This request is taking that one step further you could say