Just finished (and passed) the new EERE Residential PV Solar inspector training program. It’s FREE, for now, at http://www1.eere.energy.gov/solar/sunshot/index.html and it’s very educational. It covers every aspect of a residential solar install and not only instructs on the backing materials, but offers a chapter by chapter self assessment (test) to see if you learned what they were trying to teach! All but ONE chapter was a breeze for me, and the tough chapter was on equipment. I think the questions/answers could be a little more clear in this chapter, but HEY, this is a BRAND NEW TRAINING AID, and I recommend that ALL installers take it and PASS it, just for the sheer value of knowledge!!