iTunes 4 is the best software jukebox in the world, with a great music store inside. With it, you can create your own personal digital music library to manage and listen to your music collection, all with drag-and-drop simplicity.
iTunes encodes high-quality MP3s as well as pristine AAC, all in a free application. If you don?t like getting charged a subscription fee or paying for additional features like fast CD burning, your digital music experience is about to get a whole lot better.
iTunes 4.1 is available for Mac OS X, Windows XP and Windows 2000
http://akamaidownload.apple.com/530x3824/binaries/iTunesSetup.exe
edit: I see it has already been posted in the news section, but i'll go ahead and leave it here too.