Visual Thesaurus v3
Visual Thesaurus was released this week. The update adds audio pronunciations, a more complete dictionary and spell checking to the nearly 5 year old application. What is it, exactly? You enter a word and then see a 3d branching visualization of all its related words. You can click on each word to bring it in to focus and see the new relationships it creates. Of course, definitions and examples are provided as well. I've used Visual Thesaurus many times in the past and have to say that it's just as entertaining as it is intellectual; it has always been elegant, but this new version is even more so.