Dockables finds a clever way of accessing your most common actions from your dock. Instead of opening up windows to shut down your Mac, launch the screensaver or put your Mac to sleep you can place little actions straight into your Dock.
Dockables features a dozen or so different apps, and you can easily customize them by adding one of the different themes available. The Docksnaps can be used to separate them in your Dock.
It's a shame that Dockables doesn't allow you to create new apps, as it does not include every action that you carry out on a Mac. Adding them to your Dock is a good idea, but it can really get crowded, especially if your Dock is really busy.