This video shows you how you can make a simple 3D scanner using a webcam, laser pointer and some free software.
David-laserscanner software: http://www.david-laserscanner.com
Blender Basic Tutorial: http://www.tinkernut.com/archives/164
***UPDATE: The software has now been updated to 8.0. Please disregard the method I suggest in this video and follow the updated method that is listed here:
This is a follow up tutorial to the video posted about using a webcam to control games: