I was thinking about this same situation a few months ago.
After some googling, I found some pretty expensive devices like this:
Why not get a WD TV or something similar that has Netflix and an Optical out port?
Edit: also found this splitter, which is cheaper and has the audio out options: »www.monoprice.com/products/produ···format=2--
"Every normal man must be tempted, at times, to spit on his hands, hoist the black flag, and begin to slit throats." - H. L. Mencken