One of the downsides of having your music in digital format is that you lose out on the artwork associated with the CD. Many people like to have the artwork associated with their albums display when they are listening to music. SlimServer and several software and hardware players (like some iPod models) support album art.
Here are some tools that can automatically retrieve album art for your collection:
+ Freeware+ Very powerful
+ Freeware+ Also useful for tagging