Zune is intentionally incompatable with 'playforsure' stuff.
The reason I like Iaudio's (or Cowon) offerings is because (features depend on models) is that it just uses mass storage class. It'll depends on file directory system for one sort of playlist operation, it can read id3 tags off of files, or it can use just standard m3u playlist files.
So you can use whatever you like with them, any program you'd like.