yes, all you would do is use a regular tuner card, but you'd have to use the receiver to change the channels and anything else you'd do with your receiver. you probably won't be able to set up a tivo type function since its not the tuner card that changes the channels, its the receiver. but just for regular recording, a regular tuner card will work.
i've seen some tuner card for digital satellite/cable... but i have no idea how they work.. not sure how they go about descrembling signals... doesn't look to be illegal or anything.. maybe someone with more experience can tell us?
well i just figured out what those are.. those are for free-to-air satellite.. so no descrambling required.. just the deciphering of the digital image...