(Also posted to blender.org)
Found this on CGtalk.com:
Sub surface scattering tutorial + source code from the Renderman Academy site
http://www.rendermanacademy.com/docs/SSS_depthmaps.htm
(I can’t attribute the link as I have accidentally closed the tab with the forum thread in. Suffice to say it’s a relatively new post, and you can look it up on CGTalk.com)
[edit: found link: http://cgtalk.com/showthread.php?t=194310]
It’s a tutorial + sourecode on implementing Subsurface scattering in Renderman+Maya. I hope that this can be helpful to whoever is trying to get subsurface scattering to work in blender, as this is apparently a fairly decent ‘finished’ example and will help point out all the API hooks needed to implement. (not to say that the SSS renders I’ve seen here aren’t good, just that I thought it would help… )
Ben