TunesArt is a great companion for iTunes:
- Customizable notifications on track change
- Display track's artwork on your desktop (7 themes included)
- Last.fm / Twitter integration
- Download missing artworks
- Display embedded lyrics, in a window or on your desktop
- Instantly search in your iTunes library
- Global keyboard shortcuts to control iTunes
- Tags manager
- Display track's name and ratings in menubar
- Many more features to discover...
Note: Due to copyright restrictions, lyrics can't be automatically downloaded.