Google released a new open source application for Mac OS X 10.5 Leopard called “Quick Search Box” that allows you to search data on your computer and across the web.This app is very experimental, but through it you will be able to see many of the areas we are exploring: contextual search, actions, and extensibility. It is by no means feature-complete, but is a very good indication of things to come.

The application is similar to it’s iPhone sibbling Google Mobile App for iPhone

More info: Quick Search Box for the Mac