WizTree

I've been a big WinDirStat fan for years, but WizTree has won me over with its blazing performance, taking a fraction of the time to display every file on a disk drive in the same three-panel format. The graphical display is the best way to find those huge files you once needed but now just take up space.  WizTree is free (I love free), but you can show some love by clicking on the Donate button at the top-right.

http://antibody-software.com