Visual Thesaurus

I don't know how I ever lived without the Visual Thesaurus. Go use it (there is a demo mode) and you'll be instantly hooked as well. Type in a word and there is a visual constellation of related terms surrounding your word. Click on any of those other words and it becomes the center of the conceptual map, with new terms growing around it. Is this the first application of Ray Kurzweil's visual "mind mapping" tools? Or was it independently developed? Check out The Brain for an open ended version of the visual thesaurus, into which you can pour your own conceptual relationships...