There're a couple of apps. I'm still using this really old, free, open source one, called grande perspective: http://grandperspectiv.sourceforge.net/ http://gr

There're a couple of apps. I'm still using this really old, free, open source one, called grande perspective: http://grandperspectiv.sourceforge.net/ http://grandperspectiv.sourceforge.net/ I like it enough and it always helps me quickly figure out where all my disk space went.