OK, so I just got my new Mac Pro and I've been thinking about switching to the whole digital lifestyle. Though I will use my Mac for work, I find myself listening to music on it through headphones and I've been using the built-in speaker more and more, and the wife is giving me the go ahead to move the system from my "office" to the living room. This is a great opportunity to get rid of my old clunk surround sound and monstrously heavy tube TV (I've got a 30" ACD) and get a nice smaller system. But I never gave any thought to this before, the Pro has TOSLink Optical Audio I/O but how do I take advantage of that?