vPod is a program for transferring music to your iPod from Windows. It presents a unified view of all of your music and lets you see what is and what is not already on your iPod.

MusicBrainz is a community music metadatabase that attempts to create a comprehensive music information site. You can use the MusicBrainz data either by browsing this web site, or you can access the data from a client program — for example, a CD player

Connects MSC players into iTunes