Pittman [Groxis CEO] said Yahoo had been quicker than its competitor, Google, in creating a standard way to place relevant ads next to Grokker's circular search result maps. One information visualization tool that's received plenty of attention...
Matt at the Merc reports about the latest goings on at info visualization tool Groxis in the article: Groxis moves up in the world. I used Groxis for several weeks year and didn't find it all that useful but that could just be me and the way I search.
Grokker http://www.groxis.com/service/grok/g_products.html Search Tool & Utility Reviews Within Search Engine Watch, this page has older reviews of software-based search tools that you may find interesting.