and WinDirStat
http://windirstat.info/
You see stuff in WinDirStat format, color coded, and normal file lists appear when you zoom near enough. Multiple zoomable windows.
-tmpusr
In WinDirStat you can already 'zoom' into folders until you are on the file level. I don't see a need for a new program here. Also, this would be anything BUT a coding *snack*!