Arduped 2

Arduped 2 is a tweaked version of David Ultis's Arduped Biped Robot (http://www.thingiverse.com/thing:19594) that includes source code by Gabriel Ro-Bot-X and Kai Neugebauer to make it work. I redesigned the build platform and head sensor and tweaked the feet, but I left the original legs alone because they worked just fine. The OpenSCAD source files for these changes can be found in the zip file called "OpenScad Files with Utils Folder.zip".

Here is a video of it in action: http://youtu.be/PAQJ-nnLGbg

Materials
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Arduino nano
5 x Tower Pro SG90 servos (available on Ebay). You will need the horns and the screws for these as well.
1x Ultrasonic sensor HC-SR04
A small on/off rocker switch (should be easy to find on Ebay)
2 x M3 x 25mm screws to mount the servo for the head. M2 screws are actually preferable here as you will have to drill out the servo mount a bit to use M3 screws.
4 x M3 x 12mm screws to mount the servos to the build platform
6 x M3 nuts
Hot glue (from a glue gun) or super glue

See instructions for more details