Alert that a User is Typing a Comment or Answer
42404
When answering, could we be informed that "the following people are already answering this question"?
127692
One comment per user per post but be able to reply to existing comments
50659
When flagging a post or comment, provide a freeform text entry field for all reasons, not just "other"
34508
Notify us when the question has been edited after posting an answer
37240
Flagging "look at my answer pls" comments
121821
Commenting Regular Expressions
146244
Notification of a more popular answer than the accepted one
133560
Omit comment replies from the minimum character limit check
59454
Use of the comment package
80261
notification for comments on Example Questions in Area51
70256
Notify question OP (and those who marked it a favourite) if an answer has been modified
107519
How do I output a suggestion for a user to accept and use as input?
16630
Allow users to mark "accepted" answer on someone else's question?
91954
Comment deletion notification
128064
Is the @reply in a comment to the editor of a post broken?
2937
Asking the user for input until they give a valid response
130885
Information of the user in comments