"In music there are two schools of thought. There are people who play the notes and play them perfectly; and then there are those who look more deeply at the principles that make the music and use those principles to find the right notes.
Most of the sites noted here are for the serious student and practitioner.
How the hip moves (short animation)
Some interesting, evidence-based articles
Functional load abdominal training
Chapter from a textbook: Clinical applications of neuromuscular techniques
Technical papers for somatic (bodywork) practitioners
Two papers on the need for experience as well as reasoning
Trigger points in Treatment, by Leon Chaitow
Colleague's website with some evidence-based articles
Very technical paper on locomotion
Headache in the Whiplash Patient, by Jerry Hyman
Sensory Motor Training, by Jerry Hyman