Managing Track Info
UPDATED: Search-Replace Tag Text v3.3
Search-Replace Tag Text v3.3 performs a search-and-replace with the text in your choice of tag (Song Name, Show, Artist, Album Artist, Album, Composer, Comments, Genre, or Grouping) in the selected tracks or all the tracks in the selected Playlist. Features case sensitivity and whole word match options and dry run preview.

The latest version sports conventional search fields and has some minor code tweaks.
UPDATED: This Tag That Tag v3.1
This Tag That Tag will assist with swapping, copying, and appending data between two user-chosen tags in selected tracks or tracks in the selected playlist:
Swap - swap data between tags, ex: ARTIST<->COMPOSER
Copy - copy data from one to another tag, ex: ARTIST->COMPOSER ARTIST
Append - append data from one tag to the end of another, ex: ARTIST->COMPOSER - ARTIST
Prepend - prepend data from one tag to the beginning of another, ex: ARTIST->ARTIST - COMPOSER
The latter three actions also provide an option to delete the info from the first tag after the copy.

This latest version allows numerical tag data to be copied (for example, the Year tag's data can be copied to the Comments tag).
UPDATED: Remove n Characters from Front or Back v4.3
Remove n Characters From Front or Back v4.3 will let you delete a specified number of characters from either the beginning or the ending of the Song Name, Album, Artist, Comments, Composer or Show tag (or their "Sort" siblings) of each selected track. For example, delete the initial digits and the space from "01 First Track", "02 Second Track", and so on.
This latest version is now stay-open and floats above iTunes, has live track selection detection, re-orients preview stepper direction to abide selected tracks' sort order, can expand horizontally to enlarge Preview box, increases number limit from 24 to 60, and other minor enhancements.
Here's a screenshot of Remove n Characters From Front or Back in action during a tag editing session that also includes This Tag That Tag and Search-Replace Tag Text, which are also stay-open floaters:

UPDATED: Search-Replace Tag Text v3.1
Search-Replace Tag Text v3.1 is now posted. This applet allows you to perform search-and-replace text operations on a chosen tag in the selected tracks or tracks in a selected playlist:

This latest version fixes a problem escaping special characters, fixes a problem with operating on the Grouping tag, prevents non-results from displaying in the dry run window, adds close and minimize buttons, and has a few minor code finesses.
UPDATED: New Last Played Date v3.0
Getting date input with plain AppleScript has always been a hassle. But Cocoa-AppleScript has access to Cocoa date pickers. Hoo. Ray. New Last Played Date v3.0 is a Cocoa-AppleScript Applet for iTunes on OS X 10.6 and better that uses a text and calendar date picker to easily enter a new date for either the Last Played or Last Skipped tags of the selected tracks:

Additionally, the corresponding counts can be increased or decreased. Or the dates and counts can be set to "never".
UPDATED: This Tag That Tag v3.0
This Tag That Tag v3.0 is now a consolidated applet that previously had been a collection of four separate scripts. It will assist with copying text between tags for each selected track or track in a selected playlist.

It will float open over iTunes while being used and detect whenever the iTunes selection has changed, as displayed by Target:. Also now provides a progress indicator.
NEW: Delete All Lyrics
It's often interesting to look through the search queries this site gets to see what people are looking for. Over the past few months the phrase "delete all lyrics" has been showing up pretty frequently. Don't know why it isseems like it wasn't so long ago the phrase "find song lyrics" was more prominent. Fads! Who can predict 'em?
I already have a script that will delete the lyrics of a selection of tracks. But this would be rather slow if you used it against every track in the library. So I've posted Delete All Lyrics. This is a Cocoa-AppleScript applet (for OS 10.6 and 10.7 only) that will fairly quickly go through all the tracks in the "Music" playlist and delete the lyrics. So whether you're tired of trying to sing-along or just need to clear out some bytes, it should do the trick.
UPDATED: Search-Replace Tag Text v3.0
Search-Replace Tag Text performs a search-and-replace with the text in your choice of tag (Song Name, Show, Artist, Album Artist, Album, Composer, Comments, Genre, or Grouping) in the selected tracks or all the tracks in the selected Playlist.

This latest version is written as a Cocoa-AppleScript applet for OS 10.6 and 10.7 only and features case sensitive and whole word matching, as well as a "dry run" mode that will display a list of what will be changed before you actually commit to the search and replace.
UPDATED: Sundry Info to Comments (or Category or Description) v3.0
I sometimes hear it lamented that tracks in iTunes don't have a tag for file path or account ID or other sundry information. While you can't add new tags to a track or new columns to the iTunes browser window you can use existing less-frequently-used tags to store some of that information. I often copy a track's location (file path) to its comment tag so I can do a sort by file location when I sort by Comments. But there's some information about a track or its file that isn't as easily accessible. For instance, there's no track property for a purchased track's account ID. You have to get that by other means. And that's what this script does.
Sundry Info To Comments v3.0 is a Cocoa-AppleScript applet that copies your single choice of file name, file path (location), parent folder name, current playlist, sound volume, file's Spotlight comments, file creation date, purchase name or purchase account ID to the Category, Comments or Description tag of each selected track.

Being able to copy such data into one of these tags make it sortable or available for Smart Playlist criteria.
UPDATED: Rate Me! Rate Me! v4.0
Rate Me! Rate Me! watches your playing tracks and when an un-rated track starts playing displays a window with a demand it be rated.

While you could easily rate the current track from the iTunes icon in the Dock, this script interrupts you and compels you to do so.
This latest version is re-written as a Cocoa-AppleScript Applet for OS X 10.6 and 10.7 only.
