Healthysex.com is a great resource I highly recommend. I also recommend the book The Porn Trap for those wanting help in overcoming the use of pornography in their lives.
I also found the following article on pornography use by Wendy Maltz printed in the Psychotherapy Networker and the evolution of its use from possibly a therapeutic approach to a public health concern fascinating and would welcome any comments on it. I think it’s a great read no matter what side of the pornography debates you are on.