This script will apply user-entered text to the "Description" tag of each of the selected tracks. iTunes 5.0.1 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 album artwork as folder.jpg to Album folder
Remove iTunes tracks disassociated from files
Exports and then re-imports selected tracks' artwork
Two scripts assist with importing/managing lossless files (AL and AIFF) and sending converted AAC copies to iPod
Batch-reset the Start and Stop Time of selected tracks to their entire duration
Create a Ringtone track from a selected track