Tivo has been doing this for years. I can search for a show, see if it's live, upcoming in the next couple of weeks to record or if it's available on Amazon/Hulu/Netflix/Vudu to stream or buy. Then just click it to go straight there.

Also has a nifty feature where you can list all available episodes of a show across all seasons and it will mix in your live recordings with streaming options. I honestly don't know why Tivo doesn't get a lot more love. Cable when you aren't paying per-TV fees for boxes is pretty great. Just a couple of bucks a month for a cable card in the Tivo and then you hook up Tivo Mini units on all of the other TVs in your house to access the main box.