Floola is a cross-platform applications to play music from your iPod on any computer. It is now up to beta 34, which adds podcast support. The only time a platform choice comes into play is when downloading the installer: there are packages for Linux, Windows (98 and up), and Mac OS X (10.2 and above).
The only problem is that DRM’ed tunes cannot be played. For that, we suggest using QT Fair Use.
Thanks to GHacks for the links.