Feel free to send me me any feedback or requests for consulting work via this form.  If you have a question regarding my books, it’s probably better to post the question on Stack Overflow instead, and just send me a message with the URL of the question.  This way you will get a quick answer from the Stack Overflow community if I’m not able to immediately answer, and doing so also enables everyone to benefit from the answer.  Remember though to mark the question as answered when you get an answer that you’re happy with!