"40 things you can do to save the Jewish people" is an excellent book especially if you are a Jewish parent or teacher, other Jews would likely get something out of it as well but not as much as the first two groups.
This is an excellent list, often times funny, and gives great examples for how to compromise on what both parents and kids often want out of their Jewish life. For example, whether or not to continue Jewish education past bar/bat mitzvah.
I've already told a friend of mine who is both a Jewish parent and Jewish teacher (or was a Jewish teacher anyway) that she needs to track down this book. I may even buy a copy for her if she can't afford her own.