The December, 2006 edition of the Journal of Consulting and Clinical Psychology includes a special section on Attachment Theory and Psychotherapy. One article is particularly interesting. McBride, et al. looked at attachment as a moderator of treatment outcome in a comparison Interpersonal Psychotherapy (IPT) and CBT as treatments for depression. They found that participants higher in "attachment avoidance" did better in CBT than in IPT. Very interesting.

McBride, C., Atkinson, L., Quilty, L. C., & Bagby, R. M. (2006). Attachment as Moderator of Treatment Outcome in Major Depression: A Randomized Control Trial of Interpersonal Psychotherapy Versus Cognitive Behavior Therapy, Journal of Consulting and Clinical Psychology, 74, pp. 1041-1054.