[CentOS] monitoring space in directories

Hey folks,

Is there a Linux tool that will monitor a disk and tell me which
directories are growing over time?
I could cobble something together myself of course, but if there is already
a good off-the-shelf solution, why bother?

Even if it only checks once per day that would be fine.  Graphs would be
pretty too :-)

cheers,
-Alan

-- 
“Don't eat anything you've ever seen advertised on TV”
         - Michael Pollan, author of "In Defense of Food"