I have a couple of suggestions that I think it would be great if the admins took to heart. 
It shouldn’t take too long to implement, either, if people agree it’s a good idea.
The purpose of this site is to provide searchable, well-defined pairs of well-defined, well-written questions and their equally well-defined, well-written answers. The idea is to make the site a resource that doesn’t just help the individual that asks, but anyone who happens to stumble over the question later on. We all agree on this being the purpose.
But askers often don’t mark answers to their questions as correct, even when a correct answer exists. To be honest, I think it’s is because they’re driven by their own success rather than any kind of willingness to accept the factual correctness of anything, that is, marking an answer as correct is done only when it solved a problem and helped the asker accomplish something in his or her project. If the answer is “It can’t be done”, or “That’s kind of hard, but here’s how you can accomplish it”, then it often won’t get marked correct, because it wasn’t an easy-to-use shortcut to success. This is a problem.
I think some users, maybe those with 5k+ karma, should be able to mark answers as correct. That way, more answers that are technically correct answers might get that green checkmark they deserve.
Also, according to the FAQ, users with karma < 15 can’t upvote. Why exactly is this? This site gets questions from tons and tons of freshly created users, many of which either never return after the first question, never answer anything themselves, or ask questions so poorly worded that they’re never upvoted even once. So they often never get > 15 karma. But this doesn’t serve to say they’re unwilling to reward an answer or unqualified to determine if an answer was good. So why can’t they upvote?