I've recently noticed that my available hard drive space keeps getting smaller and smaller. Now I even get warnings that my HD is full and that I need to make space. I don't know what's wrong. I don't have too many files on my HD, or at least stuff that's mine. I don't know if the system is loading thing on to itself or what. Does anyone have an idea what can be wrong? P.S. I have an iBook G4, running Mac OS X 10.3.9. 40 GB drive.