From their website:
DAVID is a freeware software for laser range scanning. All you need is a PC, a camera (e.g. a webcam), a background corner, and a laser which projects a line onto the object you want to scan. So everyone can use it to scan objects without high costs; this is the big advantage over commercial solutions which are rather expensive.
Macouno was the first to give this a spin and he created his own setup. He improvised his way through, so the results weren't exactly great yet. I'm sure they'll improve with a better setup though.
DAVID has a few drawbacks such as not being able to stitch multiple scans together, but I think it's a great tool to experiment with. (And with some clever Python scripting, I'm sure we can stitch the scans together ourselves, can't we?).
Go ahead and download DAVID - I'd like to hear about your results!