Is neurolinguistic programming effective in influencing sales processes? In my country neurolinguistic programming (NLP) has become very popular in sales departments. Therefore, I wonder if there are any experiments which examine the contribution of NLP to the sales process. 
I was especially curious when I heard that Bander sued Grinder.


Are there any peer-reviewed validation studies of NLP?
Particularly, has any peer-reviewed research examined the effect of NLP on sales?
Section "Scientific Evaluation" in the Wikipedia article on NLP sums up current research nicely:

None of the claimed effects have been validated.

Scientists consider NLP a pseudoscience with aggressive marketing and a name and jargon that deludes people seeking help by "[giving] the impression of scientific respectability" (quoted from that section).