An improvement on 4 would be to link to the actual source of the quote, when possible -- that is, to some webpage that lists the quote along with the author. When this is not possible, rot13.com can accept short phrases (such as an author name) in the URL itself: e.g. http://www.rot13.com/index.php?text=Ryvrmre%20Lhqxbjfxl
To judge quotes on their own merits, if without some context, I propose an experimental thread in which the original authors of quotes are somehow hidden.