This is exactly what I’m talking about – Boyd’s Tin Can Stirling Engine Website .
Started off as a way of showing off his stirling engines… and now dozens of people have sent in examples of their own

There are also loads of these on Instructables and youtube.
Balancing Cube
How to start fires in Ikea
Robotic Sensory Loops and Whatnot
Servo Bender
[…] on about a couple of subjects with which I have a tangential fascination – genetic algorithms and Stirling Engines … and solar energy obviously. Everyone loves solar energy except nuke morons who are […]