But Now Competing In The New "Useful UI" Category Is ....

Two feedback comments led me to the also-free SpaceMonger.  Like SequoiaView, SpaceMonger also uses Treemaps to create a highly useful file space visualization tool.  SpaceMonger weighs in at only 212K, which makes it very carryable and emailable for use on multiple systems.

When I first posted a simple "Thank you!" for FolderSizes, I didn't know how many great harddisk management solutions were available and had no idea what I was starting!