Google Quick Search Box is an open source search box that allows you to search data on your computer and across the web. This is still an experimental app, and so many features you would see in it are not upto their full functionality.

Using for the first time, i understood its for searching the mac computer, and also the web for the keyword you are trying to search. And this is going to have some bright updates in the coming future. Looks pretty cool.

Basics that can be helpful for you -

• Search the web (Type “britney spears”)
• Start applications (Type “itunes”)
• Open websites (Type “wikipedia.com”)
• Search for contacts in Address Book (Type “Bob”)
• Find files on your computer (Type the filename)
• Find music (Type the name of a song or artist in your iTunes library)

You can download and use the Quick Search Box for mac from here.