Well, no answers, so I plugged my cable into my HDTV's cable input and did a channel scan. Here's what comes in:
Channels 2-99, maybe with some exceptions.
Then I also get:
102-1 720p (Fox11), 102-5 480i (weather), 102-9 1080i (NBC4), 104-1 480i (ABC7), 104-5 1080i (KTLA/WB), 104-9 720p (KABC-DT 7), 117 480i (ESPN Bristol color bars), 200 480i (LOD), 281 480i (ATLA ?), 282 480i (CMC), 283 480i (ATV), 782 1080i (CBSHD), 786 1080i (KCET HD), 800 480i (Barkr)
So to summarize, that would be Charter's Analog Basic (they don't look too good), and their Expanded Basic channels (also don't look good). Those must all be analog channels.
Plus you get the local broadcast networks in HD: Fox, NBC, ABC, CBS, KCET, KTLA.
Those other channels are pretty much useless. LOD is a looping Ford ad right now, 281-293 are not in english, but might be of interest to someone. I think 800 is advertising for Pay-Per-View, which of course you couldn't get.
By the way, I subscribe to pretty much everything offered, except the Digital Sports Tier.
So, apparently, all of the digital tier channels, and the premium movie channels, are encrypted. It's not looking good for a MythTV box (or any media center PC system).
There you go. Lock it down, use our boxes or go away! Sad times.
I hope I like the Moxi box that's coming on Wednesday. The SA 8300HD is a real piece. Makes my 3 year old Tivo look great... too bad no good HD with Tivo right now (Directv doesn't count - HDLite).