Google introduced “Quick Search Box (QSB) for Android,” a fast and versatile new system-wide search experience, available right from home screen, and provides suggestions as you type, making it easy to access whatever you're looking for by typing just a few characters. You can also tap microphone button next to search box to search web and call contacts by voice. Note that voice search currently only works in English. QSB also supports third party apps (look on Android Market), and enable their suggestions from the system search settings. Developers see here on how to leverage QSB for your app.