I have always tried cleaning out my hard drive of large files and trying to find them all has always been a pain in the arse. I then stumbled on a very useful application that allows you to see your file sizes visually. You don’t have to see it in tree view and try and wonder where those pesky files are. Here is a screenshot
SequoiaView uses a visualization technique called cushion treemaps to provide you with a single picture of the entire contents of your hard drive. You can use it to locate those large files that you haven’t accessed in one year, or to quickly locate the largest picture files on your drive.