SIRI and Watson and Natural Language Processing

Interesting thoughts comparing SIRI and Watson.   SIRI's natural language processing (NLP) capabilities and interface are her most obvious characteristics .... how does this compare to how Watson is being positioned?  We will continue to see more examples of the public and enterprise face of what has been in the past been called AI.  NLP is often the portal for any such systems.  In our own experiments with NLP driven expertise we chose to do as little as possible, where data was available, it was used instead of the natural imprecision of natural language.