This is a nifty little web toy that generates mind-map-looking graphics of words and associated words. The graphic uses color, line patterns, and shapes to denote such attributes as part of speech, relationship (e.g., a word and a subset word, opposites, an example of a larger category), and derivation visually. It's a bit confusing, but the key stays visible at the side at all times, so it's easy enough to find what a marking means. It might make using a thesaurus practicable, as the applet is quite fast.
(H/T to Jan Fernheimer for the re-tweet.)