SPARX, The Video Game That Treats Depression is a finalist in the Scattergood Innovation Awards. See http://scattergoodfoundation.org/innovideas/linkedwellness-llc#.UwjVYFO6Au0
Perhaps interesting extensions await for game-based cognitive behavioral therapy (CBT) in groups building on the foundation of clinical research outside of games combined with a better understanding of online game communities.
Arch, J. J., Ayers, C. R., Baker, A., Almklov, E., Dean, D. J., & Craske, M. G. (2013). Randomized clinical trial of adapted mindfulness-based stress reduction versus group cognitive behavioral therapy for heterogeneous anxiety disorders. Behaviour research and therapy, 51(4), 185-196.
Barrera, T. L., Mott, J. M., Hofstein, R. F., & Teng, E. J. (2013). A meta-analytic review of exposure in group cognitive behavioral therapy for posttraumatic stress disorder. Clinical psychology review, 33(1), 24-32.
Watkins, K. E., Hunter, S. B., Hepner, K. A., Paddock, S. M., de la Cruz, E., Zhou, A. J., & Gilmore, J. (2011). An effectiveness trial of group cognitive behavioral therapy for patients with persistent depressive symptoms in substance abuse treatment. Archives of general psychiatry, 68(6), 577-584.