Hazel is your personal housekeeper, organizing and cleaning folders based on rules you define. Hazel can also manage your trash and uninstall your applications.
Organize your files using a familiar rule interface. Filter on the files name, type, date, the site or email address it came from and more. And do more than just file. You can set color labels, Spotlight keywords and comments and even archive files. Hazel also cleans, sporting options to clean out incomplete and duplicate downloads.

In addition, Hazel can manage your Trash for you, relieving you of having to empty it yourself.

All this is done automatically in the background allowing you to focus on your real work.

Whats New
Version 2.3.9

User interface changes

Fixed typo in message when deleting a token.

Core changes:

Fixed crash on startup for certain Firefox 4 users.
Added workaround for bug where file may be repeatedly copied when doing a move across filesystems.
Fixed memory leak.
Various internal fixes.

Requirements
PPC / Intel, Mac OS X 10.4 or later.

Link for more information: http://"http://www.noodlesoft.com/hazel.php"