I am running out of space on my powerbook g4, and noticed that the libraries take up most of the space (other than my media). I have one library folder, Macintosh/Library, also one under Macintosh/System/Library, and lastly one under Macintosh/Users/(My user name)/Library. That seems like it's a little much, but I don't know, maybe I do need it. Is there a way to delete any of them, or maybe I can use an external hard drive along with my powerbook. I have a 500GB MyBook external hard drive, with a usb plug-in. Can I use that to use applications from and stuff like that? I don't know what I should do.