since i just got a new monster ipod, i gave my old one to wife, which means she now needs to use itunes to populate her player. we discovered that itunes doesn't really like two users on the same pc to use the same library. i wasted a lot of time trying to tweak file permissions, sharing, etc, but eventually landed on an idea using junction. i mapped my own itunes root to wife's itunes root...et voila!
they still don't have a version of itunes for linux.