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tordavis said:
640p is still considered High Definition.
  The ITU thinks otherwise:

"Three HDTV standards are currently defined by the International Telecommunication Union (ITU-R BT.709). They include 1080i (1,080 actively interlaced lines), 1080p (1,080 progressively scanned lines), and 720p (720 progressively scanned lines)."

 

(swiped from http://en.wikipedia.org/wiki/HDTV)