(if this is in the wrong folder, feel free to move it)
I noticed this elsewhere, and thought I'd give everyone a heads up.
http://www.museumofhoaxes.com/hoax/weblog/comments/mpaa_ratings_crackdown/ It looks like the MPAA is sending out cease-and-desist letters to fanfic writers who use the MPAA ratings system on their stories. The website I linked says that they're going after the individual writers for now instead of the archives. (browses around a bit more) Looks like some archives are getting them, too.