DRM Dumpster is a free Mac OS X tool for removing the DRM from tracks purchased from iTunes. The tool can be used for exercising traditional fair use rights, such as using iTunes downloads with a Zune.
DRM Dumpster uses a CD-RW and iTunes itself to convert all of your DRM music files to MP3 files that you can use with any music player. It automates the process of burning tracks to CD and then re-ripping them.