I've just started re-reading "The Thirteen Petalled Rose: A Discourse On The Essence Of Jewish Existence And Belief" by Rabbi Adin Steinsaltz.
Keeping with the theme of 'this is not a review', I will not go in to any detail about this book. However, if I were to recommend only one introductory book about Kabbalah this would be it. Rabbi Steinsaltz tops pretty much any other author whom I have come across, whether in Hebrew or Western Mystery Kabbalah books. After five years of reading about Kabbalah, practicing meditation, and struggling to get some kind of experiential knowledge of Sefer Yetzirah, Book, of Creation, I am still learning new things from this amazing introductory text.