Looks good on a resume. I'm currently studying for this through my employer. I'm going to go on and try for the AP as well.
In studying, I've found that a lot of this just requires one to throw money at the problem to make it green (aka LEED certified).
I'd like to start an unofficial open-source, so to speak, LEED-type program. For example my own house I would imagine has maybe enough points to get a LEED certification, but because I am not spending the money (nor do I have a lot of the formal documentation) it will never be LEED certified. That doesn't mean that it doesn't deserve some recognition though.
Same with my garage that I just built. Although I have not insulated it yet, when I will it will be tight. I've used sill sealer, lots of caulk/adhesive, energy effecient windows, insulated door, etc. It's too small of a structure to get certified, but again I wish that it coluld be recognized.