Have a look at this website Jo*Mar.
http://www.spine-health.com/wellness...nt-dysfunction

This page has an exercise regime specifically for those having problems with their SI area. If it's not what you're looking for... try searching the site from their home page. I found most things I was looking for were well covered, so tend to think it's a very comprehensive site.

While checking out this particular link, I found what I thought was probably the root of my own lower back pain and the terrible nerve pain I've been experiencing in my buttock and thigh recently, and when I mentioned it to my physio today, he totally agreed with me. I now have a much better idea of what I'm dealing with.