GrandPerspective

I discovered a handy and visually appealing little app for Mac OS X from some guys over at Sourceforge.  GrandPerspective is a volume or folder visualizer, depicting individual files as colored blocks, their relative size represented by the size of the blocks.  It's a fantastic and aesthetically pleasing way of seeing where your hard drive space is going.  Clicking on an individual block even gives you some options such as revealing it in Finder or just deleting it altogether.

Here is an example from my MacBook:

 

[caption id="attachment_1029" align="aligncenter" width="614" caption="Visual representation of files. The large block is a single 61 gigabyte file."][/caption]

 

One of the cooler aspects was pointed out by my (non-technically inclined) wife, who immediately found it both beautiful and personal to the computer it was made from.  It's kind of an individual "fingerprint" of a system at a given time.

 

GrandPerspective is free to download and use and includes source code to compile on your own.