I came across IBM Watson’s natural language demo site and played around with it a bit. Watson can be tested by entering any text or url link to get his take on sentiment analysis, emotion, keywords, semantic parsing and more.  Here I had Watson analyze the Gettysburg address:

NLP is pretty good at sentiment and emotion analysis and is regularly used to monitor a company’s reputation, for example.  In legal, we have been using NLP for quite some time for example, in the form of Technology Assisted Review for purposes of discovery and more recently, contract analysis.