Da provare il nuovo I GROK
"The I Grok search tool from Grokker uses the Yahoo web database as its index, and clusters results into "maps" with topics represented as circles. Within each topic circle, which is labeled with a descriptive name, individual web page results are represented as squares. For most queries you'll see up to nine major topics, many of which have subtopics represented as smaller circles within them." da searchenginewatch.com