Actually the sister forum here at Psych Central has a self injury forum. I can't post links yet so you need to copy and paste it into your browser address bar.

forums.psychcentral.com/forumdisplay.php?f=17

Also the OCD and Trichotillomania forum there should be helpful I think because I believe cutting can be part OCD and partly an impulse control disorder.

Here's that forum: forums.psychcentral.com/forumdisplay.php?f=72

At the root of all of these things I believe anxiety plays a big part. Control the anxiety and you may have an easier time not cutting. (My son was a cutter for awhile.) So the anxiety forum here and at the Psych forum could be helpful.