I just called Comcast...
I'm in the Boston area and switched from DirecTV to Comcast a few years back because of the HD Red Sox games and their HD-DVR. I liked DirecTV's service, but wanted more HD. I consider the 2 to be fairly comparable in these areas now.
I told the CSR rep what I'm paying Comcast now for their digital service, an HD box and an HD-DVR box, and then quoted what DirecTV's price was (about $20 less/month). They wouldn't match the price. Looks like Comcast will be losing quite a few cutomers, including me.
Can't wait til Fios gets here so I can bid rid of Comcast for good.