Anatomy of Auditory - Systematic presentation of light microscope, electron microscope, and scanning electron microscope images of ear structures. Basic anatomy, but the structural basis of the physiology of hearing is well shown.
How the Ear Works - Covers the process by which sound is converted to activity in the audiotory nerve and is aimed at a broad audience. The focus is more on hair cell physiology than on cochlear mechanics.
HowStuffWorks: How Hearing Works - Illustrated tutorial traces the path of a sound, from its original source all the way to your brain, to show how all the parts of the ear work together.
Promenade Around the Cochlea - Interactive presentation of the anatomy, physiology and pathophysiology of the peripheral end-organ. Aimed at medical and biology students, and available in French and English.