I came across this in an email from my alma mater - they are using these saws in fabrication shops and labs.

The saw actually senses when a finger touches the blade and stops it in a fraction of a second. Check out the flash movie of them cutting a piece of ply with a hot dog on the top - I must have watched it 6 times - it is simply unbelievable.

THis is no cheap contractor's saw - it's a pro level cabinet saw, and it's priced at about $2800. But it would be worth having for that one careless day -