The time has come, OS X Code (r,s) releases a first OS X application, Folder Clean-Up! So what does it do? The app is very similar to Chaos Antidote. However, there are two main differences, it's free and you just have to drop the messy folder you want to clean-up over the app and all files and folders inside will be moved into new folders based on the filetype. Additionally you can define files that shouldn't be moved. A great way to clean-up desktop clutter or all the other mess you may find in one of your folders. Read the readme that comes with the download for more information.
Mac OS X 10.4 or later