Vivisimo has launched Clusty Mobile. As explained in the release: Clusty Mobile simplifies mobile Web searching…organizing search results by relevant topics and categories rather than pages and pages of search results…[also] Clusty Mobile optimizes all Websites clicked on for mobile viewing.
Like Yahoo oneSearch, MSN Mobile and Google, to a lesser degree, results are presented in categories. (See, e.g., “Hotels, New York“). The primary “value add” from Vivisimo’s clustering technology are the links grouped at the top of results, which allow users to “drill down” into a set of results without conducting a subsequent search.