several questions/problems

1. How do I delete entire playlists?

2. I’ve downloaded 2 playlists from Windows Media Player 10 (I don’t like WMP11), and some songs from one list are on the other. Why?

3. Why can’t I download more than 2 lists? I still have over 1 gb of space left.

You can delete all the playlists on the player, but you have to connect to PC and find those playlists and delete them manually.  As for multiple playlists, you should be able to sync as many playlists as you want on the device as long as each playlist has different name.  But for WMP10, you have to set the playlist sync to be automatic or else it won’t show the playlist.