Ability to tag / mark question to later reference
30609
How do question bookmarks work?
4874
Does it matter the order you tag your question
14173
Show original question during editing a question
123839
Let users editing a question know if editing it would add it to the reopen queue
67723
Add bounty remarks to a question's revision history
49725
About question tags
22881
Labeling a text and referencing it later
21351
Could we make tags imply other tags?
134574
Wrapping long tag names in question list
93665
Is there a way to see questions with a certain tag from all Stack Exchange sites?
145116
Better drafts feature for questions
90883
Tags on badge question list
59330
Mark an answer for a question from a deleted account
145053
Can the editor for editing tag descriptions get updated to match the normal questions/answers editor?
14470
Please add the ability to fold blocks of code in questions and answers
46020
Automatically determine tags while writing a question
68312
Retagging questions in terms of possible answer technologies