One user recommended Jason Odell's ebook to get the most from CNX2. In my search for the ebook, I came across the following site that I thought I'd share.
Thanks for sharing. Indeed an good website ! Especialy this article is worth reading IMO : http://www.nx101.com/dynamicrange.html
ps : some interesting tutorial websites :
If you want to learn about CNX2 :
my photos (examples, see dpreview galleries):