Behavior Therapy (BT) and Behavioral Research and Therapy (BRAT) are two of the major journals for treatment articles. BT runs 'mini-seminars' on different treatment areas on occasion. BRAT prints articles that have a distinctly european flavor and is more grounded in associative learning models, at least when I read it frequently). The Journal of Applied Behavior Analysis (JABA) prints articles related to behavior modification (applications of operant conditionaing principles). The series 'Progress in Behavior Modification and Therapy' (the old Franks and Wilson series) is a good place for reviews and summaries of treatment areas. Behavioral and Brain Sciences is an excellent source for in-depth discussions of research and theory that often have implications for applied work.