I downloaded one of the ones with the yellow info icon in iTunes and the video is 1280 x 720, with a bitrate of 5169 kbps.
Oh wow...really? Hmm. The Zune HD should be able to play that (it can do 720p up to 10mbps or so), but that is pretty crazy high-quality for a podcast - I wonder if there's some filter on the Zune Marketplace side of things that's saying "Whoa, too huge!".
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