• The LEGO Technic Idea Book: Simple Machines
• The LEGO Technic Idea Book: Fantastic Contraptions
• The LEGO Technic Idea Book: Wheeled Wonders
The clever little walker shown in the video is from the Fantastic Contraptions volume.
From Fantastic Contraptions book description:
The Technic models in Fantastic Contraptions include working catapults, crawling spiders, and bipedal walkers, as well as gadgets powered by fans, propellers, springs, magnets, and vibration. You'll even learn how to add lights, pneumatics, and solar panels to your own models.
All three books look really good! For in-depth reviews of these three LEGO Technic books head over at the Evil Mad Scientist Laboratories Blog.
[ Thanks Denise! ]