Since the directories and files are sorted by size, you get to quickly zoom in on the big files that are taking up all the space and not worry about the thousands of tiny ones that aren't hurting anyone.

While this concept may seem awfully close to what the Finder does, it's actually amazing how much more useful it is for cleaning up your hard disks. If you aren't sure what's in a file, you can open it by double-clicking on its icon or dragging its icon onto another application. The free space on the disk and the ordering of the folders are automatically recalculated. If a file is part of the system, it'll say so on the panel (in the list of Packages the file belongs to), so you won't accidentally get rid of something that would make your system stop working. You then simply browse through the folders and files and delete the large ones which you are no longer using. Double-click on one, and a new window opens with a 'column' view listing every folder and file you can access, which it sorts by size as you watch.

When you start OmniDiskSweeper, it presents you with a list of disks attached to your machine. OmniDiskSweeper is a utility for quickly finding and deleting big, useless files and thus making space on your hard disks.

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