Wonder Wheel

http://blogoscoped.com/archive/2009-03-24-n84.html

Web sites like Wolfram Alpha, Aardvark, and Twitter are coming up with new ways of searching the Web, forcing Google to think about different ways it could appeal to searchers. One experiment this year is Wonder Wheel, which presents search results in a spiderweb format, with each search revealing several related terms to help users refine their search. For now, Wonder wheel is available as a free feature under the "Search options" menu on any Google search. It yields no associated ad revenue.