Learn to build your own walking robot with the SunFounder Nano DIY 4-DOF Robot Kit. It uses a ultrasonic sensor to avoid obstacles, and programming is easy with the companion visual programming toolkit. You can get this fun kit for 16% off the MSRP in The Awesomer Shop.
An amazing LEGO Mindstorms build from the Oslo and Akershus University College of Applied Science. This wheeled machine can approach the edge of a table, and lay down a bridge that’s sturdy enough for it to cross. Oh, and when it’s done, it packs the bridge back up.