We demoed something like this in class way back when - but this is a nice slick version. Bung a word in the search box and watch as related words emerge and dance around it, organising themselves in a 2D diagram. You can even get a dictionary definition of each.
An online thesaurus and dictionary of over 145,000 words that you explore using an interactive map.
http://www.visualthesaurus.com/?word=editorial
