“In this video, we will look at how to work with the subsurface scattering shader that comes with SOFTIMAGE|XSI or Autodesk Softimage. Learn how to use the render tree to setup and implement this useful and interesting shader to achieve a realistic look for soft translucent materials. We will be working on surfacing a jellyfish!”
http://www.cgarena.com/freestuff/tutorials/xsi/i3d/subsurface-scattering-shaders.html