Prof. Bruce Barry of Vanderbilt U. paints a scary picture in his book Speechless, about how fettered speech is in the American workplace. Then, again, if you're running a business, can you afford to have everyone saying whatever they want?
Here's a video interview of Bruce about the book, under the auspice of NY:MIEG's Bill Sobel. I was the interviewer. Video is via TVMainstream.com.