http://mmsaccounting.ca/incorporation.htm DBT Diary Card and Skills Coach
This is one of our favorite and most comprehensive DBT apps for IPhone users. It offers a customizable diary card that targets the behaviors you want to decrease or increase, offers charts and graphs on your progress, has a reference section, and coaching help on how and when to use skills. You can also email your diary card to your therapist prior to your next session. The app costs about $5.00.