[CentOS] Directory tree disk usage utility

Fri Aug 4 05:19:39 UTC 2006
Robert Moskowitz <rgm at htt-consult.com>

Is there some nice program that will display how much disk space is 
being used by each directory?

e.g.

3.9G         /
1.6G         /etc
3.4K         /etc/yum.repo

and so forth?