I've just had the spirit of Peter Gabriel surgically removed from my ear, as it was starting to annoy me with it's quasimystical folk rock vibes. And also, he was forever strapping on bizarre and unwieldy costumes and these were often so large that they restricted my hearing. There came a time when I had to whisper to Gabriel, 'Sorry mate, you've got to go. Move into a B+B or something but you're not welcome in my aural cavity anymore.'

www.sodaplay.com
go here and play with the most incredible artificial intelligence type thing EVER !!
you can create your own creatures from wire framed models then place them in the virtual zoo arena and watch how they sit and move !!!
It isn't the simplest system to use but if you're interested in biology and/or physics you can't fail to be amazed by the system.
I've just spent a happy making a cube with horns that wibbles along the floor (very amateurishly but most enjoyable)
It's all free and very clever stuff.
If you make one please email it to me so I can look at it !!