Every Mac power user knows the might of the OS X menu bar. For the rest of us, that ever-present beam topping our desktops has been ignored for too long. You’ll likely see a few icons there already—system items such as Wi-Fi signal and volume, for example. Apple calls these “Menu Extras.” What we’re interested in, though, are third-party menulets or “applets”—super-charged icons that when clicked offer quick access to inspired utilities and novel services. If you’ve got a Dropbox account, you have one; likewise if you have Growl. But there are many more out there just waiting to be discovered. Here’s 20 of the very best.