I purchased the Second Edition (September 2006) of "Kilimanjaro: The Trekking Guide to Africa's Highest Mountain" in July 2007. Within a week (as I was sitting on airplanes far too often and had time to read), I had read the 300+ page book cover to cover.
The book is excellent, informative, and often humorous. The trail descriptions are detailed and precise, and the other guidance (medical, financial, logistical) is essential. With a little effort, I matched the trail descriptions to a superb map that I purchased at the same time and quickly gained an understanding of the various routes, options, outfitters, and issues. (The map is "Kilimanjaro Map," scale 1:62,500, 3rd edition, ITMB Publishing.)
One comment: there are many trails (or potential trail combinations) offered by the various outfitters and trekking agencies on Kilimanjaro, so you will likely find yourself flipping back and forth through the book to follow YOUR route. Give yourself time to absorb the book thoroughly. And be prepared with your highlighter and notepad close at hand so that you can identify the portions of the book most relevant to your specific route and itinerary.
If you're considering a climb of Mt. Kilimanjaro, or have a friend or family member considering doing so, you will find this book to be very useful.