Via:
http://www.youtube.com/user/prusajr?feature=watch
Update:
As many readers noticed: USE EYE PROTECTION! LASER ARE VERY DANGEROUS FOR YOUR EYES! ...
Update 2:
I was just thinking that this is part of a larger trend of DIY desktop 3d printers becoming multifunctional machines that do more then just print. They could mill, route, cut, scan ... It could spawn whole new range of machines, true small scale desktop factories ...