Quite a few people have asked if I will be writing any intermediate books. Unfortunately, I'm not planning to. There are a number of reasons for this. First, the licensing issue is a pain. Second, the ITIL intermediate courses require attending an accredited training course.
However, there is an excellent resouce to help you prepare for your ITIL intermediate exam. This book helps you to prepare for what to look for in the exam and how to parse the case studies for the relevant clues to what the right answer is.