Here's an easy and cheap way to hide cable clutter: use plastic split electrical wiring conduit. You can find this at just about any auto parts store, and it's pretty cheap. The nice thing about this stuff is that it's split so that it's easy to get wires into and out of it. And it doesn't look bad at all. It looks a lot better than a bunch of loose wires. I use it on my entertainment center in the living room and my wires on my desk.