Lately I have been looking around for free svn+trac repositories. Naturally, I came to SO and found a "question-answer thread" with multiple edits, as some of the providers changed their free repositories into charged ones (maybe v.v. and multiple times). Combined this development with the reputation system on SO, this can lead (or has lead) to a slight mess as some users post an answer of the new state, while others add edits to their old posts and so on.
Inspired by that use case, I wonder if it could be a good idea to introduce some kind of feature on SO that allows tracking information that is in flux. Maybe some special kind of question where an edit/update can yield reputation. This could lead to a very clean site with easy to sight/ordered information, further enhancing the use of SO.