Does the S3 support unencrypted digital cable channels, aka QAM in-the-clear, without a CableCARD?
Partially. Clear QAM channels can be tuned directly by entering the correct channel number. Recordings can be scheduled by time and channel. There is no guide data for digital cable channels without CableCARD, and hence no Season Passes or Wish Lists are possible. There is currently no way to manually map channels. TiVo is looking into the possibility to provide mapping in the future.