I'm going to set a record here for shortest comment.

Re: James/Sirius: I think there's considerable canon potential here. I mean, Sirius *moved in* with the Potters...Granted, it would have been better if they'd gotten their own place together, but still - I think a lot could be done with that OotP-revealed fact, and I haven't seen it really.

Not that I've particularly looked. :)