Several guides to manga were published in 2007-2008 but this is by far the most complete one. The coverage of titles is truly comprehensive -- although of course they are all manga, so that means no graphic novels, Korean manhwa, Original English Language manga, etc. Still, I have not been able to find a single manga title published in English before 2007 that this book doesn't have at least some information on. And since these series are published over a long time period and the U.S. publication dates lag behind the original Japanese publication dates by several years, this book is still in 2011 an up-to-date resource on most of the popular manga titles, except for the absolute newest ones.
The book is arranged in alphabetical order by title. Each entry includes the Japanese phonetic title, translation, and kanji title along with author's name. This is followed by the names of both the U.S. and the Japanese publishers and the different dates of publication in each country, as well as the name of the magazine it was originally serialized in, and the total number of volumes. My favorite detail is the category (shojo, shonen, josei, seinen, yaoi, yuri) as well as the genre (fantasy, crime, occult), followed by age ratings that include specific content notices (language, nudity, sexual situations). If you are a parent or librarian trying to decide whether a certain title might be appropriate to purchase for a child, this information is absolutely invaluable.
Last is the review and star rating. I love the fact that many of these are not just plot summaries but honest-to-goodness signed reviews that help gauge the quality of the plot and artwork, as well as place it in context. In general I agreed with most of the reviews and ratings. The titles that are not individually reviewed, especially the newer ones, still have descriptions.
As another reviewer noted, many of the yaoi and mature (including yuri) titles only have basic descriptions instead of reviews and therefore are not rated (perhaps 50%)...however, that still makes this far better than any other manga guide I have seen. Some ignore the yaoi/yuri/mature categories all together, or include only a handful of titles. This book is as close as you're going to get to a comprehensive listing. Also I like the fact that these titles are in a separate section in the back so that they're not mixed in with the titles for children.
Finally, my favorite part of this book is the subject-specific essays and recommendations. I have read other guides organized by genre, such as Graphic Novels: A Genre Guide to Comic Books, Manga, and More (Genreflecting Advisory Series) and 500 Essential Graphic Novels: The Ultimate Guide, but they include only the broadest of genres. This book includes genres that I have noticed but have never seen discussed elsewhere in print, such as cooking, games, music, pets, politics, etc. I especially appreciate the entry on josei manga, with the largest list of josei I have found. These essays appear in alphabetical order throughout the book, although you can also find them listed in the table of contents. The genre essays average about three pages in length and explain the history of the genre in manga and its relation to Japanese culture, followed by a quick list of titles that fall into that genre. For example, the "horror" genre article provides lists of recommended titles broken down into pure horror, action horror and vampire manga. The essay on "Occult and Religion" is the longest, at five pages, and includes listings of titles featuring angels, devils, Christian imagery, ghosts and shinigami. No other genre listing comes close to the depth and breadth of this resource.
In addition to all this, the introduction has a great history of manga in America, decade by decade, as well as an explanation of "what makes manga different." In the back are excellent articles further discussing issues such as age ratings, censorship, sexism, and race. I highly recommend this book as either a personal or professional reference for anyone who is interested in manga.