Spotted on the MAKE Flickr pool, this Arduino-controlled two-servo walker, demo’d at the recent Dorkbot Bristol. Looking at the images close up, you can see this is an insta-bot, made with just the two servos, some coat hanger, and zip ties.
Speaking of servomotors, Solarbotics has just released some sweet-looking tiny (22.8×9.5×19.8 mm, 0.90×0.37×0.78 in) “pico servos.” Only $16 each.
The GWS PICO+ servo (GWSPIC+F/BB/F) has a ball-bearing supported output shaft, and a Futaba connector (great for connecting to microcontrollers!). It comes complete in a blister pack containing all mounting hardware and servo output arm options.