BotJunkie made me aware several days ago of Petman. Now humanoid robots are nothing new these days and without arms and with tethered cords, this might seem rather primitive. But between the speed and the agility this bot is far ahead of the pack.
The company which makes it, Boston Dynamics, also made Big Dog – the scary-ass cool-beans buzzing robot mule (notice that he looks clumsy but does not wipe out on the ice as I tend to):
They are working on the noisy power source so he will eventually not sound like a swarm of bees with PMS.
Here is the most advanced version (at least, the most advanced one that is not classified and carrying a grenade launcher and a machine gun).
(1:09 = LOL)