I’m a fan of iTunes, I use a Mac, I have an iPod.  But the Amazon MP3 store kills iTunes.  Apple charges 99c for regular songs that only work in iTunes and on an iPod and $1.29 for “iTunes Plus” songs without copy protection that work with any software and in any player.  Amazon charges 89c or 99c for songs, and they’re all without copy protection and work with all software and all players.  And it’s a very good user experience, and the Amazon mp3 downloader software makes integration with iTunes seamless - one click and you buy, download, and import into iTunes.  Highly recommended.