If you're looking for a holiday project, a new kind of futuristic musical instrument, or need to impress someone - build a laser harp. Instructables user "Shobley13" has used an Arduino, several laser pointers and some optical sensors to create a device that senses breaks in the laser beams - which emulate harp strings - and sends the signal out via MIDI to a suitable computer with music software. And the results are outstanding - watch the following video:
If you're interested in more advanced Arduino projects and usage - get yourself a copy of "Practical Arduino" by Jonathan Oxer and Hugh Blemings:
Create your own Arduino-based designs, gain an in-depth knowledge of the architecture of Arduino, and learn the easy-to-use Arduino language all in the context of practical projects that you can build yourself at home. Get hands-on experience using a variety of projects and recipes for everything from home automation to test equipment. For more information and to order, click here.