Originally Posted by 6spd

I would love to do this, but I just dont have the equipment... but anyway to answer the OP's question, you can download a youtube video downloader off of CNET. It works great and videos can be saved as a bunch of different file types. The audio can be separated using any cheezzzyy video maker.

Its much easier to plug a cable into the home theater system from the computer though and will still sound like nasty balls.