Currently, we have 254 questions with no answer at all, and scrolling through a few pages of questions, there is a good deal of questions with no accepted-mark.
Can I suggest we all skim through the unanswered questions and make an effort to answer them? Or, if they are unsalvageable, maybe get rid of them?
How can we encourage (particularly new) users to tick the accepted box? It is good for everyone that questions have accepted answers.
I do not mean that we should have accepted-ticks on every single questions, some will, by the nature of the Q, not have a single, perfect answer. I am merely suggesting that we should encourage people (and teach them) how this works.