These take pre-created playlists and evenly shuffle them together into a new playlist. You can make a "battle of the bands" playlist, alternating between bands. You can shuffle 5 genres (for example, Jazz-Country-Rock-Folk-Metal) so that every 5th tune is a jazz tune. Perhaps you'd like to alternate between new tunes and old tunes, your wife's favorites and your favorites, etc. These scripts make this easy to do.
(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.)
Paste non-ID3 Tag track and file related info into Category, Comments, or Description tag
Copy chosen tag info from one set of tracks to a different set of tracks
Remove iTunes tracks disassociated from files
Assists with finding truncated iTunes Match tracks
Add/replace display artwork to selected iPod/iPhone tracks from corresponding iTunes tracks
Use tag info from selected track to search Amazon Books for cover art