This has got to be one of the most useful advanced Oracle Forms books out there (Let's face it - there are enough useless ones). Written for Forms 6i, it takes you through many techniques inadequately covered by the bog-standard Oracle Press books, such as how to base forms on stored procedures and FROM-clause queries, how to dynamically populate list items and create hierarchical tree structures, and other extremely useful and not immediately obvious development methods.
I would highly recommend this book to both professional Oracle Forms developers and beginners. I genuinely believe that you will find it hard to buy a better book on this subject.