It appears that the Amazon MP3 Downloader will not work with Leopard. I spoke to Amazon MP3 support this morning. I am unable to download an album I purchased. They advised me to download track-by-track without using the downloader software (which I reinstalled after upgrading to Leopard). I tried to trash the downloader but thanks to Time Machine it keeps coming back each time I try to download a track without it. I need to study Time Machine a bit to see how to get rid of it for good.