If you like watching other people work, you are going to love the YouTube channels of Myfordboy, Keith Fenner and Tubal Cain. [more inside]
One of the classic arguments against evolution by natural selection is "what good is half an X?" where X is an eye, a wing or some other complex body part or system. Directly responding to the implicit challenge some researchers have been not just figuring out how X could have evolved, but actually evolving new complex machines (previously). The basic ideas are so simple that web versions (explanation and discussion) have been popping up.
Incredibots. Make crazy machines! Solve puzzles! Share with your friends! And that's just the beta. Similarly [more inside]