This is probably old news to those of you who have iPods, so ignore if you choose.
I have a whole bunch of music that I've ripped onto my work computer using Windows Media Player (I can't have iTunes at work). I have them in a play list that I listen to when I'm doing a bunch of solo work. Now normally, the play list plays in the order of the albums I added to it. In other words, it plays one whole album in order, then the next, etc.
Well, the other day I discovered that Media Player also has a shuffle function, so I shuffled the songs on my playlist today.
It's like I'm listening to all new music. I'm hearing songs I had no idea were on any of the albums. It's amazing.