I seem to recall that they were using a fresnel to effectively double the amount of light striking the panel, and that by doing so they hoped to achieve $$$ efficiencies in the $1 per watt territory (in volume).
As you guys know, most PVs don't operate anywhere near optimal conditions for exposure. For instance, I fiddled with my 53W panel, and was never able to get more than about 36W out of it. They are non-linear though... and to get maximum power you have to have to impedance match the load. I think some of the more high tech battery conditioners do this.
I suspect that with a small amount of reflected surface i can boost the output of the panel without endangering it.
I have a cheapie panel at home that I may experiment with just for grins!