Liquid Information is one of those time-saving utilities that you can't live without once you start using it. Advertised as a "Swiss Army knife of text," the OS X utility lets you select a string of text in any app then search, look up, translate, calculate and share that information quickly. All you have to do is select your text and hit "command-@" to pull up the list of available actions in Liquid Information.
Keyboard shortcut gurus can get fancy with commands like "command-shift-2 r,w" which will automatically search your selected text on Wikipedia or "command-shift-2-t,e,g" which will translate your text from English to German.
You can download Liquid Information from the Mac App Store for $0.99. You can see how it works in the video below and test it out for yourself on the company's website. Liquid Information is running the server version of the tool, which lets you select text on the site and tap the liquid droplet to search, translate and more.