Speaking of DIY/open laser dacs, one of my friends built one called the ether-dream. (http://ether-dream.com/ http://ether-dream.com/) You can control it over e

Speaking of DIY/open laser dacs, one of my friends built one called the ether-dream. (http://ether-dream.com/ http://ether-dream.com/) You can control it over ethernet and all of the firmware is on github. I put together a simple AVR based laser system once that projects a UV laser onto a glow in the dark surface. Check out at http://lm741.posterous.com/ http://lm741.posterous.com/ if you're curious.