Ghosts of Future Past http://etrix-lists.livejournal.com/8369.html
Summary: Dean already knows that the future isn't looking good. Sam's sneaking out at night and lying about it. Dean's pretty sure the angels are dicks and that they're lying to him, too. It isn't until he gets a visit from his own ghost that he realizes just how bad it's going to get, and the future that was becomes part of Dean's memories of the past. Surely, with all that he knows, he can fix things—if he can stay alive and sane, that is.