If  Sling Media  could  work out a deal with Netflix  where  Netflix's instant  movie rentals on PC could be integerated into Slingcatcher,   it would be a killer app.

It would be direct competition to cable's on demand  service.

 By  integerated  I mean once you set up your Netflix account Slingcatcher can directly access  Netflix

(not through an app running on a PC - sling projector)