I think it's cool how you can hover over a user's question and get a small text sample of the question.
However, I never use it because of two reasons:
It takes too long to pop up.
It's a small box and the text is unformatted, making it difficult to read the question.
I would suggest that when you hover a question, a bigger, nicer popup comes up that shows the user's question properly formatted.
Would you find this feature useful?