Visual Thesaurus from Princeton

Finally … a thesaurus that works the way my brain works. Some of you may have seen this already, but I think this is really neat.
http://www.visualthesaurus.com/online/index.html
I am quite sure this is based on the original ThinkMap technology that’s been around for a while, but this is a neat demonstration of how it can be utilized. The online version is limited use (unfortunately), but it kept me busy for a few hours.