iArt can automatically get album art and lyrics for your iTunes Library!
iTunes will then also synchronise this to your iPod so that you can view the album art and the lyrics on the iPod. The program can automatically search to get images for your albums, or you can use the manual mode to choose find them yourself.
The program supports automatic mode in which it selects the right album by scanning the album tags and the track tags. It also supports Google Image Search as a source of album covers so that you can get results even for very rare albums.