This script will apply user-entered text to the "Category" tag of each of the selected tracks. iTunes 5 or better.
(Note: In order to launch this PowerPC-era script on an Intel machine, it must first be opened and then saved using AppleScript Editor, which is located in your /Applications/Utilities/ folder. More information is here.)
Export artwork of selected tracks to parent or specified folder
Load this script in your Login Items to activate an iTunes playlist at startup
Album-Artist pairs to HTML doc
Continuously update your desktop picture to current track's artwork
Restore each selected track's artwork from an image file stored in its Album folder
Export info to HTML doc