Have you ever dreamed up a new feature for an application, like using network drives for Time Machine backups, or changing the sounds Mail makes when you send messages? Sometimes these features actually are in the application, they’re just difficult to find and change. Most of them require you to know how to use the Terminal or find files deep in your Library or System folder.
Secrets from the awesome people at Blacktree lets you change those settings through a preference pane in System Preferences. Suddenly all those features your Mac’s been hiding from you are just a checkbox away. Be careful though, changing the settings marked as “dangerous” might not be a great idea.