Dialectical behavior therapy (or DBT) is a behavioral therapy originally developed by Dr. Marsha Linehan for the treatment of borderline personality disorder. DBT is based on the idea that behavior change can best occur through the acceptance of emotions. DBT focuses on teaching individuals a number of different skills, including mindfulness, emotion regulation, distress tolerance, and interpersonal effectiveness skills.
Although DBT was originally developed for people with borderline personality disorder, the skills presented in DBT may also be helpful for people with posttraumatic stress disorder.
You can read more about DBT in this article from About.com.