I've finally gotten an HD capture card (PCHDtv HD-3000) running in a Linux box I have set up. (This box also runs Mythtv, an opensource Tivo alternative, it's very cool).
Much to my surprise, Adelphia seems to be pushing quite a few digital channels over the line as well as regular cable. I'm not sure if that has to do with the broadband that's coming down as well, but I'll find out fairly soon when I shut that off ($45 a month for BB? come on.) Note: I don't subscribe to the digital package, just basic cable (up to ch. 77)
Anyway, I've mapped out the frequencies & PIDs for most of these channels, including WCAX, NBC (from somewhere, but not sure where). If people are interested, I'll be glad to post them. A straight scan came up with 307 hits, with about 60 of them being valid streams, including some 40-odd music choice channels. In the meantime, I'm trying to get the silly computer to play HDTV at a reasonable framerate, and will have more info as I have time to work with it.