Mac Tips: How to let Gatekeeper open Mac apps from unidentified developers

Have you ever downloaded an app on your Mac, only to be told you couldn't open it because it wasn't from the Mac App Store or wasn't from an identified developer? If so, you're experiencing Gatekeeper, a tool that debuted in the last release of OS X Lion that's designed to prevent questionable software from causing trouble on your Mac. For some users, this can be a great feature that helps keep their Mac safe; however, for power users who know they are downloading apps from trusted sources, it m