The official ATSC home page:
Latest news on the digital TV front:
Introduction to HDTV by K.J. Kuhn, University of Washington:
An excellent paper on the formation of the HDTV standard and the players in the HDTV enterprise:
The FCC (Federal Communications Commission) page:
A good guide for selecting video compression codecs, along with an explanation of common codecs such as Intel Indeo Video (including R3.2), Microsoft RLE, Microsoft Video~1, and Cinepak is the Adobe page:
An excellent list of (the many) video formats including analog ones.