You should look at what Nvidia did in their 8 series tech demos. Anything here so far has just been a really broad fake of thin object translucency there is no scattering going on at all.. kinda akin to what specular is to reflection. The Nvidia stuff actually simulates the diffusion with blurred RTT bakes of the objects…
Interesting topic, I've been interested in faking SSS in game art for a while now, but I've been thinking about it in a different way (for characters). Is it possible to bake down an SSS pass like an AO pass and just overlay it on a characters diffuse? I know it wouldn't technically be SSS but it would look nice around the…