Answers to the questions I am interested or commenting?
30609
How do question bookmarks work?
80261
notification for comments on Example Questions in Area51
132014
Can I see a list of questions that I have favourited?
23614
A method for the OP to accept comments?
28528
Where should I post my sum-up of the answers, as the OP?
1052
Subscribing to questions and comments that don't belong to you
90462
Marking comment as an answer?
15852
Posting and answering questions you have already found the answer to
28202
What's the incentive to answer questions?
148199
Finding the question I've started answering
74386
View history on SE questions
128221
Promoting comments to answers
17798
Is there a place to ask opinion based questions?
64514
Can there be a notification for bounties started on questions you've asked or answered?
53369
How to Give Credit for An Answer in the Comments
20118
Is there any way to favorite/bookmark an answer?
146401
How does SO get the related questions when I ask question?