Fujitsu Laboratories of America has made available a cool utility for web browsers that enable the web user to further refine web searches.
This tool is available for Internet Explorer and Mozilla Firefox web browsers.
What it does is add a box with related keywords on popular search engines and other websites.
You can hover on the search box to get the list of suggested keywords that can be appended to make the search more useful.
They are working on expanding the usability by adding support for more websites and search engines.