A good tool to view files on your hard disk and see where you are using up space – SequoiaView. Gives a graphical representation of where files are and how big they are. Most other apps you find are going to be shareware or cost 20-30$. Using this tool I have found things I have forgotten about that were taking up GB’s on my hard drive, and made it easy, I didn’t have to search around in every folder. Pretty good util.