Grokker is now available as a free java-enabled web service. Grokker a web search engine that clusters its results and presents them in a unique circular map. Grokker relies on Yahoo’s search engine (which was built on Inktomi) to produce a result set from a query. Vivisimo’s Clusty is another clustering search engine but one that offers a more traditional hierarchical text-based view of the results and draws on a handful of systems (e.g., Looksmart, Lycos, MSN, …). It would be interesting to compare their clusters. See the NYT article Your Internet Search Results, in the Round for more background.