They seem to have a pretty nice API (<a href="http://docs.wordnik.com/api" rel="nofollow">http://docs.wordnik.com/api</a>), including:<p><pre><code> * Definitions from the The Century Dictionary
* Frequency data reflecting occurrences in our alpha API corpus
* Example sentences for words
* An autocomplete service
* Access to our Word of the Day</code></pre>
I remember some of Wordnik's PR was an article about their PR - <a href="http://www.nytimes.com/2009/07/05/business/05pr.html?pagewanted=all" rel="nofollow">http://www.nytimes.com/2009/07/05/business/05pr.html?pagewan...</a><p>It is interesting though, definitely an upgrade from dictionary.com or merriam webster.