I just purchased a new 50" Sony HDTV with a built in tuner. It can receive ota HD channels as well as HD channels from cable. I'm located in SE michigan with Comcast service. When I attached the cable to the tv, I performed the auto search function and it came up with 75 analog cable channels and over 100 digital channels. My question is this, on the digital channels I see a number then a .X so that the format may look like 7.1 7.2, etc. Does anyone have a channel listing for this format for the detroit area? I've tried the comcast web site and can't find it. I'm especially looking for the INHD channel and the Discover HD channel. Thanks!