I note on the appleTV site also that the heading says "what's on TV? Anything you want." It does not have a limiting statement like "anything you want, as long as it is iphoto, imovie or itunes based."
Also, just wondering, I never messed with TV-on-Computer when I was in the windows world. Is eyeTV and whatever TV options there are for mac as good as what is available for windows boxes?
EyeTV 2.0 is as good as anything out there software wise and the EyeTV hybrid is a top notch (if pricey) piece of hardware. Unfortunately because of either Steve's Biases or the delusion that everyone is going to give up live TV to buy from from the iTunes store it's not intergrated as well as the PVR software on the windows side. I keep hoping Apple will wake up and spend to the small amount of money it would take to buy Elgato.