I recently bought a new Aluminum Macbook (2.4Ghz) and I'm having some issues regarding HD space. To be more specific, when I'm downloading torrents, I usually get the message that I need to free up space on my startup disk. This makes no sense to me because I have 200G+ of available space. I think this issue may have something to do with system maintenance, but I'm not sure what. Any ideas? Keep in mind that I'm using utorrent beta, so that may have something to do with it. I'm not sure what it means to clear user cache or any of that nonsense, so can someone please fill me in on what I should do to keep my machine running smooth? Thanks!