One behavioral thing that I've noticed about how I browse is that if there's an interesting question, I'll read it, then I'll read the comments and then vote on interesting answers/insights for the problem as I go - but then I usually forget to go back to the top to vote on the original question.
I don't vote on the question immediately because sometimes the answers to a mundane seeming question revealing a lot more depth to the question than I first noticed, and I think this is reducing votes on questions if other people are somewhat similar to me.
So my suggestion is to make the question voting buttons (for example) follow you through the page, or at least easier to access on each question. Not being a UX person, I have no idea what the best way to implement this is, but I think that it should be apparent when reading answers how you have voted on the question.
EDIT: After reading comments on this, the main reason that I want this sort of functionality is that I read a lot of questions in areas that I'm not familiar with, so I often don't have knowledge base to evaluate the quality of a question alone. So I find that sometimes reading the responses to a question make me realize that the question was actually more interesting than I originally had thought.