GSN has a lot of HD content. I get the channel on Time Warner Cable.
All their original shows produced after 2009 are HD.
Everything under the "Original Programming" section on the left is HD.
Native HD shows include 1 vs. 100, Baggage, Catch 21, Lingo, American Bible Challenge, Newlywed Game, etc. And yes, The Pyramid.
It certainly would have been better than adding that shrieking troll, Nancy Grace's network.
DirecTV needs to make some smarter choices about what HD programming they carry or they will never be considered seriously by the HD enthusiast. This is a good start but I still won't subscribe to them until they add a few more key HD channels like Fuse, The Hub, OWN, Sundance, and of course the mentioned GSN.