After a quick search I found the robots that Dr. Tony Tether of DARPA showed in his presentation in Atlanta:
http://www.bdi.com/content/sec.php?section=robotics
If you click on BigDog (A.K.A. "Creepy Bot") or RHex it will take you to a specific page on each where you can see the same videos shown in Atlanta.
It does seem that there is a commercial RHex under development:
http://www.rhex.net (or
www.rhex.org). Check out the media page where they have 17 more videos some of which were and some of which were not in Dr. Tether's presentation. You have to click through a couple of "next" pages to get to all 17 videos.
Is anyone else just a little bit creeped out by BigDog? Its cool but just a bit too creepy for me!