New diffuse shader, "Fresnel", which using existing fresnel formula. Since it hilights edges (away from lamp), nice to fill darker parts with the new layering system. Weird stuff though; http://www.blender.org/bf/0001_0040.avi (Movie disappears in a couple of days!) Note; for ray-shadow you need to use the Bias, to prevent 'terminator' problems. I made that option default now.