Foam Rolling

Here's an article on the IDEA website with information and videos regarding corrective exercises:
http://www.ideafit.com/fitness-library/the-top-10-corrective-exercises

Here's an online course through PTonthenet:
http://www.ptonthenet.com/courses/Foam-Roller---Self-Myofascial-Release-...

It includes the following:
Why and how of SMR
The kinetic chain and relationships
Effects of fascia and collagen on movement
Overview of neuromuscular anatomy
Assessing with the roller
Mobilizers – what are they? when do I use them?
Video clips of various positions and applications on the roller
Types of acceptable SMR tools
Review and FAQ

Here's some detailed information from NASM on flexibility training and the importance of SMR (when and how to incorporate):
http://www.nasm.org/hfpnpreview/article.aspx?id=2371&term=self+myofascia...

You can also find courses at local fitness conferences, like the IDEA World Fitness Conference, ACE Fitness Symposium, Atlanta MANIA, DCAC, etc.

I routinely use the foam roller with my clients and for myself. Just be cautious of your clients' health history and use only when appropriate. Try it out and see how it improves your fitness program!