The science of acoustics has been and is being applied to a large number of different problems. The following is a list of interesting applications of acoustic techniques.
A YouTube example where they manipulate your hearing to mimic the effect of spacial changes in the location of the source (requires headphones).
Putting a fire out with sound.
Standing sound waves can be used to levitate small objects. Here is an article in Nature about sonic levitation.
Turning scientific data into sound is called Sonification. Videos of the Sonification of the Tohoku Earthquake in Japan and of particles from the sun hitting satellites:
Various resources on musical acoustics from the University of New South Wales.
Dan Russell’s page of simulations and animations on acoustics.