I was watching the Donny Deutsche show on MSNBC last night and they were talking about people who took products in they use in their everyday life and improved upon then. The one guy in question was an avid wood worker, former physicist, and current patent attorney. He has had several friends lose fingers while working on their table saws so he was looking for some safety features to add to his saw. What he came up with is the saw blade can sense whether it's cutting wood or into a finger. When it senses it is cutting into a finger the saw blade disappears down into the cabinet of the saw. I would not have beleived this if I didn't see it for myself. They've got some promotional footage on their website. Some of the videos are kinda long and take a while to get to the point where they actually run a hot dog through the saw as their substitue finger, but it's well worth the wait.
www.sawstop.com
www.sawstop.com