I know that Comcast and Tivo have a deal to begin offering On Demand on the Tivo Premiere sometime in the future, but my question has to do with what is available now; I've searched Comcast's website and other online forums and can't find a definitive answer. I have a Tivo HD and currently use it only with OTA broadcasts, Amazon, Netflix, etc. I also have a Mac Mini attached to my HDTV. My internet service is via Comcast. If I add Xfinity TV to my Tivo HD via two CableCards, will I get full access to Comcast's online On Demand services? Because I have the Mac Mini hooked up to the television that would give me everything the integrated On Demand service would give me with just a little interface inconvenience. Thanks.