I hope this hasn't been posed here before. If it has please ignore this.
Here is a little remote programing trick I saw on another site for your Comcast remote that will give you a Tivo like 30 second skip for skipping commercials on Comcast's DVR
1. Press the "cable" button at the top of the remote to put it into Cable Box control mode.
2. Press and hold the "Setup" button until the "Cable" button blinks twice.
3. Type in the code 994. The "Cable" button will blink twice.
4. Press (do not hold) the "Setup" button.
5. Type in the code 00173 for the 30 second skip.
6. Press whatever button on the remote you want to map the skip function to. (I used the lock button).
Here is a little remote programing trick I saw on another site for your Comcast remote that will give you a Tivo like 30 second skip for skipping commercials on Comcast's DVR

1. Press the "cable" button at the top of the remote to put it into Cable Box control mode.
2. Press and hold the "Setup" button until the "Cable" button blinks twice.
3. Type in the code 994. The "Cable" button will blink twice.
4. Press (do not hold) the "Setup" button.
5. Type in the code 00173 for the 30 second skip.
6. Press whatever button on the remote you want to map the skip function to. (I used the lock button).