Here are some great links I think anyone trying to learn more about SI dysfunction should check out.

WebPT: Your SI Joint: An Owner’s Manual

Joint Ventures Physical Therapy: What is the SI Joint?  and Sacroiliac Joint Dysfunction.

PhysioWorks/John Miller: Sacroiliac Joint Pain.  Thorough article by a PT which has a great outline of four stages of recovery, from immediate pain relief to preventing re-injury.  Totally meshes with my own experience.

Coordinated Health: Low Back Pain Part 1: How does the SI joint relate to other causes of low back pain?

Coordinated Health: Low Back Pain Part 4: A physiatrist explains SI joint dysfunction.

What is the difference between SI Dysfunction and Inflammation?  In this video, a spine surgeon discusses the differences between these two overlapping concepts.

Bodyzone Posture Professionals: Sacroiliac Pain and Nerve Pain  (does not go into detail on specific SI motions, but great advice from a more general perspective.  I especially like Point #4 about how the body is made to move, and overuse often results from forcing the body to do too much of one thing).

Madden Physical Therapy: 3 Steps to Permanent Relief for SI Joint and Pelvic Pain and Top Three Exercises for SI Joint Pain 

Tim Highland, Champion Fitness Physical Therapy: Sacroiliac Joint Dysfunction Analysis 

Vicki Sims & Gainesville Physical Therapy  

Taylored Training and Fitness: SI Joint Pain: Symptoms, Causes And Treatment

Dr. Stephen Esses (physiatrist): great overview— how sacroiliac joint injuries occur, as well as a look at the history of treating them.  (Update: the website seems to be having some issues at the moment, but I’m leaving the link up for if and when it gets fixed!).