We have used a training on Compassion Fatigue by Eric Gentry (Compassion Unlimited LLC) He provides awareness on our physical responses to vicarious trauma (the vagus nerve/neurobiology of stress) and then walks you through a variety of coping skills and stress reduction techniques. The training is available in DVD form. I liked it because he focuses on validating vicarious trauma for providers and then offering perspective shifts as a way of eliminating the need for a stress response in the body.
Another great resource is Buddha and the Brain; Rick Hansen talks about stress response and perspective shifts as well.
The Sanctuary Institute website (Dr. Sandra Bloom) also has tons of free resources, articles and cirriculums for purchase that include ways to address parallel process and encourage emotion regulation.