Anil Dash speculates that Tivo users could hack a connection to the (free) TV listings that Microsoft’s Media Center OS downloads. This raises a broader question about Tivo’s business model. Tivo charges a monthly fee for downloading program listings, but that’s not really what costs Tivo money. They need recurring revenue to be able to keep the price of the box manageable. Eventually, TV program guides will be freely available, despite the best efforts of the patent fiends at Gemstar. (If Carl Malamud has his way, this will be sooner rather than later.) Can the Tivo model work with other revenue streams, such as targeted ads and premium downloadable programming? I suspect so, but this hasn’t yet been proven.