I recently discovered that you can easily add spaces between Mac OS X Dock icons. Here’s how.
Simply open the Terminal and run the following command:
To see changes you need to restart the Dock process:
You can drag and move the spacer between icons as you would do with app icons. If you want to add another spacer simple re-run the first command. An example of what you could obtain
For geeks: if you want to add the spacer to the right side of the Dock (documents section), run the following command: