Disk usage analyzer??

[Beartooth]

Poking around a brand spankin'new install of FC6 on a testbed machine, I
stumbled onto an app called, apparently, "Disk Usage Analyzer."

It looks to be a thing I've wished for for eons. Did it already exist in
FC5 under some other name? What?

Or is it new? Does it have any other names? It sure looks like something I
want to keep handy, and consult at intervals.

-- 
Beartooth Staffwright, PhD Neo-Redneck Linux Convert
Remember I know precious little of what I am talking about.