The Dialecticon is now available in the Chaucery fun section of this site. It was inspired by an old blog entry on Americanisms, and allows anyone to easily see how synonyms vary according to location. For example, how much more common is the term 'sidewalk' in the US compared to the British term 'pavement', and what about in Canada and Australia? Now, go play...
Updated 12 May 2007: I've added some more examples to the dialecticon, including some which demonstrate how to use it to compare the spelling skills of various countries. Did you know that almost half of British web pages containing the word 'dumbbell' spell it incorrectly?