If in your house or in the same PC there live various iPod users, it is probable that conflicts arise when managing different iTunes libraries and playlists. Each person has their own styles and tastes. To solve this problem you could use a program like iLibs.
iLibs lets you administer multiple libraries for
iTunes and comfortably interchange them, moving from one to the other easily. This way you can create multiple users and assign a different and exclusive library to each member of the house. Thus each one will have their own personal iPod library within the same PC.