Hello! This is the cheapest and easiest way to make a two-dimensional laser show projector. It uses just one pivoting mirror, powered by the focusing mechanism from a CD or other optical drive. They said it couldn't be done, but Ljudmila's skunkworks GRL research facility delivers anyway! ;) This design was first discovered in 2006 and sucessfuly made by several beginners at the Laser Tags workshop in 2007. I hope this Instructable, my first, will help to spread it around and let all of you make, test and improve it! Here shown using an Arduino for control, but you could hook some other signal into it easily, from a music player, a soundcard or some other electronic circuit.
http://www.instructables.com/id/Micro-LASER-Show-with-a-CD-Lens-Mechanism/