There are 2 travel guides dedicated to Kyrgyzstan: Odyssey and Bradt. They are both excellent, but take a slightly different approach.
Bradt travel guide to Kyrgyzstan
A very complete offering from Bradt. It’s a Lonely Planet-type book, full of useful practical information to help the traveller once he is on the ground. Tiny hamlets are covered, and there is lots of information for the independent hiker. As an inspirational trip planning guidebook, the Odyssey is much better, but in terms of up-to-date practical travel intelligence, no book will get you through Kyrgyzstan better. Updated in 2015.
Odyssey travel guide to Kyrgyzstan
The Odyssey guidebook is for the slow traveler with a deep interest in Kyrgyzstan. There is more background here, and the Odyssey guide has room for minor sights that the Bradt guide leaves out.
Although it is of less use as a practical handbook for travel, it does serve the outdoor aficionado with lots of inspiring pictures and trekking routes. Last update in 2008, so don’t expect to find the latest hip bars of Bishkek listed here.