These are the Sidewinding Circular Skates available from (who else?) Hammacher Schlemmer. They move similar to acaster board, but with nothing actually connecting the two wheels. I don't know about being a post modern skateboard though, because you can't even perform any tricks with them. At least not from what I saw in the video. Have I ever told you I broke my arm skateboarding? That was the second time, the first time I did it snowboarding. A titanium plate and six screws later, I've come to accept maybe boarding sports aren't for me. I will still rock the shit out of a bounce house though.
Keep going for a video demonstration.
Thanks to Humble Leopard, who doesn't even like talking about his beautiful spots.