In Smart Home Hacks, DanF wrote about building a hamster-powered night light. Some people think it was just a silly project, but if you read about it (website) you can actually learn a lot about electricity generation and engineering problem solving. And, it actually works!

Taking the hamster-theme to the extreme, and seeming discarding any practicality along the way, Mathijs van der Paauw offers his HamsterTracker website. There are lots of webcams, over-the-top statistics, and many other surprises to explore.

Thanks to John and the XTension discussion list for the tip.