I remember coming across a list of Fedora 14 features that had a new application was being included in F14 to access Amazon MP3.
I can't seem to find the page again.

I read about Banshee including support for Amazon; however, I remember this being a separate, new project. I use KDE+Amarok, so I'd rather stick with a dedicated utility, but anything better than cajoling Amazon's official utility to work with new versions of Fedora and 64-bit would be wonderful.