This is a truly innovative add-on for the Firefox web browser, that is causing me to rethink my use of Google Chrome as my browser of choice.
Currently Google Chrome does not support add-ons, but apparently will in the future.
With the Search Cloudlet add-on, when you search with either Google or Yahoo, you will get a tag cloud generated which summarises your search results into a tag cloud. The tag cloud comprises all the keywords relevant to your search term. Clicking a tag, adds it to your search terms and refreshes the search with results which zero in on what you want.
You can also see which sites are represented in the search results.
This add-on was written by a research organisation - The International Software and Productivity Engineering Institute (INTSPEI).