Adafruit industries is devoted to providing tools and tutorials for do-it-yourself enthusiasts. Bruce Lowell built founder Ladyada's workshop, full of cool details. He's even got instructions so you can build your own Ladyada.
I'd never seen this kinetic sculpture by Theo Jansen before, but it's pretty amazing. What's more, there's now a LEGO version by kvanb on Cuusoo. It even works (seen here with the original artist Theo Jansen).