Very interesting, thanks for sharing.
Yeah - he looks mean and cute at the same time.
That is the same basic concept I built TED around - http://letsmakerobots.com/node/35632
It works pretty well for the limited degrees of freedom.
I was just thinking that I don't own any servo's yet (only recently got a microcontroller) so if I wanted to make a walker then something like loki would both get something capable of walking forwards, back, left and right while looking kinda cool and not costing a billion pounds in expensive servo's. I believe the link mentioned the ankle ones having to be all right torque wise but doesnt look like it would be too much of a problem. I see greater issues from my material selection available to me if I was to attempt on :P