Having ripped most (but not yet all) of my CDs to my iBook's hard drive, rated most (but not yet all) of the tracks, and set up a series of overlapping smart playlists to get a random mix that favors good music being played more frequently, I am now really enjoying listening to music a lot more often than I used to. I have an automatically-updated playlist of 25 shuffled songs at any given time: five random 5-star songs not played in the last three days, ten random 4-star songs not played in the last week, and ten random 3-star songs not played in the last two weeks. It works remarkably well.
Radiohead's "Morning Bell" is a really great song, both the Kid A and Amnesiac versions. Just though I'd let you know. Carry on.