Animations, videos, and
background on waves
Kettering
animations:
http://www.kettering.edu/~drussell/demos.html
Superposition
http://www-unix.oit.umass.edu/~phys114/AnimationPages/FigsI-19&20.html
Wave
tank videos:
http://www.shs.d211.org/physicsd211/virtualphysics/sound/WaveWeb/waveindex.html
Small
images but crisp animations of ripple tank situations
http://www.infoline.ru/g23/5495/Physics/English/int_ref.htm
http://physicscourses.okstate.edu/hauenst/class/ph2414/suppl/waves2/int.html
Pelamis
wave power system