Wordnik for LA Teachers?

Anybody used Wordnik? From the CS Monitor; "Ms. McKean’s brainchild is called Wordnik, and it combines the best practices of the old-fashioned desk reference with Internet innovations. Words can be tagged like a blog entry, their pronunciation recorded and replayed like streaming radio, their related words cataloged like a list of books customers also bought at an online book depot. When the paper page gives way to the Web page, everything about the way we think of words will change, McKean says. “This project,” she predicts in a quiet voice devoid of bravado, “is going to completely revolutionize all of dictionarymaking forever.”