Oh my word (literally):

It's a visual Thesaurus

You plug in a name, and a Flash-driven applet shows you how the words are related in a three-dimensional, rotatable map. And it breaks down whether the word is a noun, verb, adverb, or adjective, and by literally connecting the dots, you can read definitions and examples of the words in use. Clicking on one word, or link, opens new connections.

How fucking cool is that?