The DBT Workbook is pretty good: http://www.amazon.com/gp/aw/d/157224...=sr_1_1&sr=8-1=

The DBT class on Yahoo: http://health.groups.yahoo.com/group/dbtclass/

And old favorite that a lot of people around here like: www.dbtselfhelp.com

There is also a DBT chat here on PC on Saturdays.