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Comcast Remotes Device Codes -- includes online code finder and links to printable PDF manuals
Comcast Cable Box Manuals -- not quite up-to-date but has most major boxes currently widely used.
Instructions for setting resolution on newer SA/Cisco cable boxes: http://info.xfinity.com/Comcast/Portal/content/Comcast/VideoMicrosites/MeetYourGuide/Images/hd_setup.pdf
Comcast Digital Migration Information
Comcast Encryption of Limited Basic Information
Comcast Customer Forums
Comcast direct hotline for X1 customer support: 1-877-896-8678
How to use a Motorola DVR: http://en.wikibooks.org/wiki/How_to_use_a_Motorola_DVR
While a little out of date this has solid information and plenty of tips and tricks for setup and configuration of Motorola set-top boxes. This includes how to access the hidden setup menu to set HD resolutions and digital audio preferences. As well as an extensive discussion on the Comcast silver remotes and custom programing them for volume locks, 30-second skip, and more.
Comcast HDTV section on avsforum.com:
AVS Forum contains discussion on many topics for the A/V enthusiast, like TV programming, detailed discussions on hardware(cable boxes, DVRs). This is the main Comcast HDTV page on the avsforum.