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ABC, NBC, CBS, WB, PBS <- are only like one show a day in HDTV
the only ones playing HDTV fulltime are I think HBO, Showtime and DiscoveryHD.
If you have the TV that supports it then might as well get it, once you watch a couple of shows in HDTV and then switch to a normal channel, you can clearly see the difference (at least on a big tv).
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