GrandPerspective is a small utility for Mac OS X that can draw two-dimensional views of disk usage within a file system. This can help you to manage your disk, as you can easily spot which files and folders take up the most space.
Carefully crafted over a period of three years, preceded by more than a dozen releases, GrandPerspective 1.0 is now available for download. The most striking change is the improved appearance, featuring amongst others a customizable toolbar with newly added Focus controls and a new Open with Finder action. On top of that, there have been a whole list of minor improvements and a few bug fixes.
The new release is available at http://sourceforge.net/project/showfiles.php?group_id=148156. More information about GrandPerspective can be found at the project's homepage: http://grandperspectiv.sourceforge.net/.