I currently have an ibook g4 that is slowly running out of space to keep my itunes library. I was thinking of keeping the music portion on the ibook and the tv shows/movies on an external harddrive. So far, this would be easy. However, I have an iphone that I like to put both music AND movies on occasionally and I think syncing with multiple libraries would screw it up. What would be the best options to have music on the main ibook hd, movies/tv on an external, and be able to keep it all together for the iphone? I was thinking perhaps 3 libraries. One for music that is kept on the ibook, one for movies that is kept on an external, and the last would be the iphones library which combines the two? Is that at all possible?