iArt is a shareware software that can be used to download album art or lyrics for your iTunes or iPod library. It uses a plugin architecture allowing for complete customizability over where to find album art in future!
iArt 3.1 adds support for lyrics. It can search online and download lyrics to your iTunes which can then by viewed on supported iPods.

The license of this software is Free Trial Software, the price is $10, you can free download and get a free trial before you buy. If you want to get a full or nolimited version of iArt, you can buy this ipod software software.