The Act on Anxiety Workbook is a self help workbook that can be used as a companion to the ACT for Anxiety book.

 
Talking ACT gathers the accumulated wisdom of a few years of interaction on the ACT listserv into one accessible source. Sure to be a wealth of information for those wishing to delve deep into ACT and have many questions answered.

Contextual Cognitive-Behavioral Therapy for Chronic Pain outlines an ACT based approach to chronic pain.