Google Quick Search (QSB) is out for MAC platform (besides existing Windows). Once installed you can search any damn thing on your computer or internet. As you type, it will pop-up suggestions (like Google Suggest) for easy and quick click through to required stuff. As seen in image below, just type cal to hop over to calculator on the computer.
Besides quick search, you can quick open Google Quick Search box using Ctrl + spacebar keys at the same time. You can even do more than just searching with Google QSB. How about sending some quick tweets? Twitter Plugin for QSB allows you to twitter in cool comfort. So be it Twittering or searching on your computer or the web – grab Google Quick Search Box (Windows and Mac). [source]