What’s so great about guys hacking the Toyota Prius is not just that it shows the potential of fuel economy if only Detroit/Tokyo would get behind it, but also that it shows the power of open-sourcing your product. This guy did the work of a dozen guys in lab coats and it didn’t cost Toyota a thing. If companies would let their customers improve their products, everyone would win. I keep pointing to the mods a blogger proposes on Treonauts. And come to think of it, why does Apple say you void your warranty if you open up one of their boxes; they should reward you for opening up the box and helping them think out of it.