I've just updated my SO question on annotated bibliographies after finding an excellent bibliography in a book I'm currently reading.
I intend to do do the same in the future whenever I find further good annotated bibliographies as I think of SO as a great resource where people can get information on all sorts of topics. Information that should for ceratin types of questions be updated as necessary.
What about having a badge for people who come back and edit their posts a certain number of times (5?), over a certain minimum time (6 months?)?
"Love the show!" oh, wait a minute, that's Buzz Out Loud...
Edit: I don't think that this should apply to CW questions.