Can all music and playlists/ratings be transferred back from an iPod Touch to a PC?
Try SharePod:


  Change 
  Add and remove music, videos, playlists and artwork on your
  iPod.
  
  Backup 
  Backup all those tracks you just can't lose onto your computer.
  Import them automatically into your
  iTunes library.
  
  Share 
  SharePod can run straight from the iPod itself, so you can use
  it at work, school, home - wherever
  you and your iPod are.