Ordered?

People like to impose order on their surroundings. I suppose that many of us have our own reasons for the order in which we strive to keep things. (Even if just for that one day that we originally set things up.) I read a post on the Design Observer page about ordering books by colour that was very interesting.

So on a slightly different but still relevant topic, I wondered how do all of you out there order your CD's? Alphabetically? By when you bought them? In no order at all? Is there a reason for your obsession or have you never thought about it?