Automatic following of answers to your question
86307
Are comments on answers to my question supposed to show up in my recent activity
78459
Comment promoted to answer
3385
Automatically redirect anonymous user from unanswered duplicate question to corresponding answered version
66156
Stack Overflow interesting questions implementation
58500
Clicking tag in question should present a list of questions
148199
Finding the question I've started answering
136525
Automatically building a database of forward and backward citations
133049
Way to convert an answer to a comment?
18726
Receive Notifications for Comments on any Answers to Your Question
35930
First post review queue: answers are questions, questions are answers
113783
How can we help users who repeatedly ask similar questions or update constantly?
68312
Retagging questions in terms of possible answer technologies
70503
Add "Answer Later" Tab
31280
New Feature: real time updates to questions, answers, and inbox
18236
How can you get the permalink for an answer to a question?
45059
SMS/text message notifications on answers to your question
36484
Handling answers that build heavily on (or are copied outright from) existing answers