I use Daniusoft DVD to Zune Converter,it can convert DVD to Zune MP4, MPEG-4, WMV, rip DVD audio to Zune MP3, WMA, M4A playable on Zune, and convert ISO file to Zune easily.

The Zune can hold approximately 1,000 songs for every 4GB. So the Zune 4 holds 1000 songs, the Zune 8 holds 2,000 songs, the Zune 16 holds 4,000 songs, the Zune 80 holds 20,000 songs, and the Zune 120 holds 30,000 songs.

go to the zune website to activate them with the zune program

Whatever songs that you get when you have the zune pass you keep.