Mac memory allocation visualization tool?

[asterroc]

Somebody on my flist posted a program that would let me see where all my memory is being allocated on my Mac. The problem is that I've got only a couple Gigs of HD space left (used 89 Gigs of 93), and I just moved all my document files off onto an external HD, and that was only 2-4 Gigs. So I want to know if the rest are images, audio, programs I don't use, or what. Help!

Comments

[l0stmyrel1g10n.livejournal.com]

videos take up a lot of space, depending on quality and length. audio does too, but less than video, providing it's not uncompressed or lossless. applications, depending how involved they are, can be anywhere from 150k to 500MB. when i run out of space, the first thing i do is delete programs i don't use.

[zandperl.livejournal.com]

Turns out I've got 8 Gigs in podcasts, very few of which I actually listen to.