Sound links

Here's a very nicely done overview of the physics of sound "by students and for students" at think quest.org.  Great illustrations of the concepts.
http://library.thinkquest.org/19537/Physics.html


Here's one that's not too exhilarating, but a well written overview nevertheless. Covers things like diffraction, refraction, standing waves, etc.
http://www.physicsclassroom.com/class/sound/

"The Nature of Sound" with special emphasis on natural sounds, whales, birds, etc.
Good illustrations and examples.
http://physics.info/sound/


Sonic boom explanation and recordings

http://www.youtube.com/watch?v=-d9A2oq1N38

More on sonic booms

http://www.youtube.com/watch?v=gWGLAAYdbbc