Here is a nice article that talks about natural language understanding (NLU), compared to NLP. It is most concerned, however, with the theoretical blindness of most of the people working in the NLP business. Here is the beginning:
I have mentioned this elsewhere, that there are now plenty of so-called natural language processing (NLP) “experts” that have never heard of many language understanding puzzles like intensionality, nominal compounds, scope ambiguities, opaque contexts, etc., and have never been exposed to centuries worth of work by the likes of Gottlob Frege, Bertrand Russell, Ludwig Wittgenstein, W. V. O. Quine, Rudolph Carnap, etc., not to mention the likes of more recent thinkers such as Richard Montague, Jon Barwise, Hans Kemp, Jerry Fodor, George Lakoff, Jerry Hobbs, etc., and that this is exactly like having an expert physicist that never heard of the Third Law of Thermodynamics, or a physicist that have never heard of Isaac Newton or Albert Einstein.
That is basically sales pitch, summary and punchline of the text in one.
That guy should blog more!