I recently noticed my Comcast DVR (Motorolla DCT6XXX something) had different looking menus from before, indicating to me that the firmware had been updated. Incidentally, this breaks the firewire DVR goodness I have been using for months to increase my DVR storage space. I'm going to call Comcast and complain that they are breaking FCC rules here. The only thing I could find on the nets was this single forum post.
If anyone out there knows of a solution, please post comments here.