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Book on the subject: Gregory Kramer - "Auditory Display - Sonification, Audification and Auditory Interfaces"

Thanks, ordered. There's a substantial body of research in this area, and we're just becoming conversant with it now.

For something a little more recent, take a look at http://sonification.de/handbook/ and http://sonification.de in general

A friend of mine does sonification research and crosses it with musical composition... very approachable NPR story on it: http://www.npr.org/2013/02/10/171639280/want-to-create-a-spa...