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. The "Learning to Play Guitar..." one is 640 x 360, 1576 kbps.
Is the first too much for the Zune too handle? I know that iTunes will download these but if I try to sync to my Nano it will not copy over if it's 1280 x 720.