Lifehacker are promoting an essential iTunes app for shared computers. Libra allows you to manage more than one iTunes music library on one machine by creating, renaming, deleting and activating different libraries, including playlists and preferences.
This is handy if you have a family machine or if you share a computer as each user can now personalise iTunes to their own tastes. It is also useful if you have more than one mp3 player e.g. you may have a iPod Nano with limited space that you only want to sync a few playlists and also a 60GB iPod which can hold the whole collection, and then some.
The app works on both Mac OS X and also Windows, which is an added bonus as most good iTunes apps are Mac only.
To download the app click here.