Macmillan has just launched a new free online dictionary. New features include audio pronunciation and a thesaurus. Coming soon: search widgets, toolbars and RSS feeds for the popular word of the day.
First impressions are good. The minimalist interface is clean and easy to use. The audio pronunciation feature is really useful for learners, and there are even sound effects (check out the entry for "wind"). Best of all is the fully integrated Thesaurus—just click the T button in an entry to review related words/synonyms. One of these days I'll get around to comparing the various online dictionaries, but it's safe to say that the Macmillan Dictionary is one of the best. You can find a collection of online dictionary and translation resources on my links site www.emnenglish.com.