At Macworld, I had the chance to play around with Pixound Jam Studio, a nifty little application for turning pixels into audio tones.  The main premise is as such: you move your mouse around the screen, perhaps over an image or a document, and the RGB values for each pixel translate into a different instrument.  You can change the amount each contributes, as well as varying the pixel difference tolerance for smoother sounds.

So far, the practical applications for Pixound can be counted on your fingers.  But it is a very fun toy, and is useful for DJ’s, particularly irreverant musicians, and anyone who just wants to hear what their art sounds like.

EDIT:  Oops, meant “Pixound.” Silly me.