Originally Posted by Dr.Gonzo
Are ALL The TV Shows in HD? If not what percentage?
No, right now there are only about 40-50 shows available in HD. Note that these also sell for a premium price of $2.99 per episode, rather than the usual $1.99 per episode.
You can find a listing of all HD TV shows on the iTunes Store here
(link opens iTunes).
Right now it's mostly major-network programming, so you're not likely to see things like Discovery Channel shows, but shows like CSI, House and Monk are available in HD versions, at least for the current seasons.