Can Stack Overflow implement AJAX refreshing for questions and answers (the way it works on Gmail, or similar to Slashdot's 'New Stories' feature)?
It wouldn't work while you were answering a question - as the text box would potentially move out from under your cursor while you were typing. Not a good thing.
While answering you get the notification of new answers at the top and have the option of reloading the page - I think that's enough.
There might be a benefit to extending this to occur while just reading answers, but again I wouldn't want it to happen automatically.
I can't see any use for it on the questions page though.