SequoiaView uses a beautiful visualization technique called cushion treemaps to represent the entire contents of your hard drive as subdivided blocks of your computer screen. The visible surface area of the blocks represent individual files as a percentage of the total drive capacity. You can zoom in on subfolders, and show the map with a block representing your free disk space. The utility can color code and filter specific file types.

http://www.visuallee.com/weblog/images/sequoia_treeview.jpg

SequoiaView was developed by the computer science department of the Technische Universiteit Eindhoven and the download is only about 500kb. It installs easily in Windows, and a 43 gigabyte drive full of files took only a minute to scan and render. There is no Mac version, but SequoiaView worked fine through VirtualPC to scan a large shared folder 

http://www.win.tue.nl/sequoiaview/
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CategoryInformationVisualization