We haven't released a direct API for Chef Watson yet. However, there's lots of different APIs that you can get access to via the Watson Developer Cloud (http://www.ibm.com/smarterplanet/us/en/ibmwatson/developercl...). Probably one of the most interesting the new Natural Language Classifier API, which we just released last week (http://www.ibm.com/smarterplanet/us/en/ibmwatson/developercl...) - you'll need to have a Bluemix (http://www.bluemix.net) account and then go down to Bluemix labs to get the service.