AppleScript
UPDATED: Tracks Without Artwork to Playlist v3.1
I only updated this a few days ago, but I managed to get Tracks Without Artwork to Playlist v3.1 to create a playlist much faster.
UPDATED: Set Video Kind of Selected v3.0
If you have visited recently, you may have noticed that I have been updating some of the more popular offerings to universal binary, so that scripts run natively on both PPC and Intel Macs. Set Video Kind of Selected v3.0 gets the UB treatment, as well as some performance fixes. In lieu of iTunes' ability to batch-edit video properties for videos, this script will change the video kind property of the selected tracks to your choice of "Movie", "Music Video" or "TV Show". Additionally, "Show Name", "Season Number", and "Episode Number" can also be set or cleared for each selected track.
UPDATED: Tracks Without Artwork to Playlist v3.0
Had some time to quickly update Tracks Without Artwork to Playlist to v3.0. It now runs as universal binary and has some performance fixes and finessings.
UPDATED: Move Playlists to Folder v2.0
Move Playlists to Folder allows you to select one or more playlists to move into a selected folder. This latest version just has some performance fixes.
UPDATED: Export Smart Playlist Criteria v2.0
Export Smart Playlist Criteria will create an XML file containing just the criteria of the selected Smart Playlist(s). This file can then be imported into any iTunes using the "Import..." menu command. Since the XML file contains only the rules for a Smart Playlist and not its track data, you can handily back up your Smart Playlist criteria or share with other users...just zip and email.
NEW: Rescue Playlists from Folder
The script Rescue Playlists from Folder will extricate all of the playlists in a selected Folder at once by making a copy of each in the Source column and then deleting the original from the selected parent Folder. Otherwise, to yank playlists out of a Folder, you have to drag each one--one at a time--to the left edge of the Source column.
UPDATED: Compare Two Playlists v2.0
Four year old Compare Two Playlists has been completely re-written. Quickly evaluates two playlists for tracks that are common to both and exclusive to each, creating a text file report on the Desktop.
UPDATED: New iPod Playlist From Selection v3.0
New iPod Playlist From Selection will copy the selected iTunes track, or the tracks of a selected playlist, to a new iPod playlist. Works only with iPods set to "Manually manage songs and videos", that is, not to sync.
UPDATED: eMusic Search v2.0
Added a "Similar to: Artist" option to eMusic Search v2.0. Also runs as universal binary and has some minor performance enhancements.
UPDATED: Needle Drop v3.0
Fixed an error in Needle Drop when canceling from the first dialog box, made it universal binary, and added the ability for it to quit automatically if you pause iTunes while running it. This script will play through the tracks of the selected playlist at your set time interval.