This question already has an answer here:
I often come across interesting new questions which don't have any answers yet. To further my knowledge, I would like to revisit these questions when they do have answers.
I would absolutely love it if a feature could be implemented where one "subscribes" to a question and gets some type of notification when either the question is answered, or an answer is accepted.
These notifications could form part of the other notifications in your inbox.
What I do at the moment is "favorite" questions with the hopes of (a) remembering to look at questions that I've previously "favorited" and (b) that the questions do in fact have an answer now.
I think such a feature could go a long way in promoting learning and knowledge sharing over and above the questions that you ask yourself.
Would love to hear what the community thinks of this.
Note: I posted this question on the Electrical Engineering meta here Feature Request: Notifications for question answers. It could be useful for all sites though.