Okay, here's the deal. My wife and I both have iPods. We share the same iMac and iTunes. Our taste in music is similar but different enough that there's a lot of songs she has put in the iTunes library that I don't want on my iPod. The simple solution is to create different playlists and to set up our iPods to draw from different play lists. And I realize there's other ways to "keep it seperated." Here is my concern. If I copy a ton of songs from our iTunes library to my playlist(s), will this not, in effect, be duplicating the files on the hard drive? I'm afraid that if we approach the problem like this, we will very quickly consume all the space on our hard drive.