I would like to see a new measure added to user profiles, that of the percentage of questions for which the user accepted an answer he himself provided.
It's certainly true that every user has the right to find her own solution to a problem, to post and accept her own answer. And it's reasonable that she earns no reputation for doing so.
However, I also think every user has the right to select which questions he wants to spend his time addressing, and, more to the point, which users. Can we agree that it's a bit of a risk to spend time and effort in composing a high-quality answer for a user who is clearly new, has no account, and has no history of either asking or answering questions? Or who has a low accept rate?
In the same way, I think there is risk involved in answering a question by a user who has a penchant for answering her own questions, even after the community has given considerable time to providing advice, direction, and code.
So I propose the creation of a new measure, self-accept rate, equal to the number of self-answered questions divided by total number of questions multiplied by 100. I don't think it if necessary to post this figure with the user summary box on questions and answers. But it would fit well somewhere not inconspicuous on her summary or reputation page.
Update after the thrashing
Ok, I got it, the idea is not popular. But gentlemen, you must acknowledge a fact: reputation is the currency of StackOverflow. Like it or not, it is a prime motivator of much of the activity here. People quote it on resumes, people refer to it in technical talks, people request that it be accessible on their linked-in profiles. You can exchange it (via bounties) to get answers to your difficult questions.
I understand that accept rate was (ostensibly) created as an incentive for people to accept answers. And it's not the most popular feature. But let's face it, the incentive worked, and for a reason. People want their efforts to bear fruit. People don't want to feed a leech.
But enough is enough on this dinger of a suggestion. Now for a second question: does StackOverflow provide an API? Because I think it would be fun to implement this thing, you know, giggles.