TuneUp Companion 1.08
Windows XP/Vista, iTunes 7.x/8.x.
Publisher's description of TuneUp Companion
A plug-in for iTunes that automatically cleans up and normalizes your music collection.
It your music collection is a mess, TuneUp fixes it. TuneUp integrates seamlessly with iTunes to clean your music collection using the world's largest music database and cutting-edge waveform recognition from Gracenote.

TuneUp also automatically searches for missing cover art in your collection and lets you know when your favorite bands are coming to town. When you're listening to music, TuneUp automatically presents related content from the web like music videos from YouTube, merchandise from eBay, and recommendations from Amazon. Say hello to your music's new best friend.
Here are some key features of "TuneUp":

Automatically clean your mislabeled music
Find your missing cover art
Be alerted to upcoming concerts based on your collection
Get the best music content from the web.

iTunes 7.x