I've bought the PC-Engine software bible book from them which goes over every single official Hu-Card game in existence as well as lots of unreleased games.
Besides this it features lots of info on all the different hardware configurations and general in-depth history on the system.
I got this one even though it was completely written in French, which isn't really my strong point to say the least.
Absolutely love the book and would have loved to buy their other works as well, if only it was in English.
Well looks like mine, and many others prayers were answered as the Pix'N Love crew have started translating and releasing their publications in English.

Just pre-ordered the first Nintendo history book myself.
Oh and if you'd like to do the same, you'd better hurry as they will only be printing a limited amount of them.

Foreword:
Pix'n Love Publishing was founded in 2007 by three young Frenchmen, each very passionate about the history of video games. Their goal is to offer gamers, as well as anybody curious about the subject, a selection of reliable books about their passion: video gaming and its history. During their three years on the market, they've published, re-released, translated and written over 25 books in French. Some even became real best sellers in France and French speaking territories. Today, Pix'n Love Publishing goes international and is proud to bring you some of their most successful releases, fully translated into English. Secured, safe and trustworthy, this website, via Paypal, will allow you to get a hold of books recognized as the ultimate resources on the subject. Every item will be shipped within 48 hours following the order and delivered in less than a week (average international shipping). Three books are already planned to be released. The first one, the History of Nintendo (1889-1980) will be available around the end of August. We recommend you pre-order it though, as this will be a very limited edition!

Pre-order NOW !
The History Of Nintendo
Volume 1
1889-1980 From Playing-Cards to Game & Watch
Limited edition! Pre-order Now!
For the first time ever, over 500 card games, tabletop games, toys, electronic and arcade games are presented in detail in a single book!
Six years in the making, this first volume of a long series invites you to discover the forgotten past of Nintendo, from its origins in 1889 until the early 1980's. 240 pages of exclusive content, illustrated with over 2,000 exclusive pictures, and a plethora of unbelievable documents and funny anecdotes await you.
What they said about us:
"Few know the history and culture of Nintendo better than Florent Gorges and Isao Yamazaki."
Brian Ashcraft (kotaku.com)
Author: Florent Gorges (in collaboration with Isao Yamazaki)
Release date: 2010/08/25 (pre-order now)
Price: $25 + $4 (worldwide)
Number of pages:240
Plastic reinforced cover
Language: English
http://pixnlovepublishing.com/topic/index.html