There is/was some company that did digital film (http://www.side.com/). But it's so expensive, it's cheaper to buy a fullblown dSLR. I can't remember ever seeing a working model of them either. There are digibacks available for things like hasselblats.

What is a friend? A single soul dwelling in two bodies. - Aristotle
-= Glass Eye Photography =- -= My Rendo Gallery =-