1. Sidewiki (www.google.com/sidewiki): This browser sidebar lets you contribute and read insights and tips alongside any web page. Leave comments, links or videos that other Toolbar users can vote up or down.
3. Google Wave (http://wave.google.com): Still in “limited preview,” Wave combines e-mail, social networking, instant messaging, video and collaborative document editing. Colleagues can work on the same document at the same time, seeing every change as it is made.
5. Wonder Wheel(http://blogoscoped.com/archive/2009-03-24-n84.html): Explore a topic by seeing what other subtopics relate to it in a wheel-and-spoke graphic. After you search, click “Show options” then select “Wonder Wheel.”
6. Google Squared (www.google.com/squared): Compare items more easily by lining up search results in a chart. For example, compare digital cameras with a chart that includes description, resolution, price, etc.