Grokker – visual search engine
OK. Only one library so far, that I know of, who supposedly uses Grokker to support their site: Standford University Library Digitization project (with SUN Microsystems.) I don’t know if they already use it or scrapped it.
EBSCO, one of journal aggregators, implement this service as well since March 2006. Demo for EBSCO is here.
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