It would be better if there is an option available with user, where he can track the questions which intrigues him. For example, suppose one encounters a question which is not yet answered, and he wants to be intimated somehow, once an answer is given to that question (Imp: He is not the owner of that question, he is just curious to know what the answer could be, etc)
This already exists in the lower right corner for each question:
This is an RSS feed link which is question specific. For questions which you ask, you can also subscribe for updates via email.
Note: You can also favorite the question using the star icon below the up & down vote buttons.