I just got this book for Christmas and it is great. I have rode much of Montana over the last two years and have enjoyed it very much. With this book I was able to re-visit some of the rides that I did and now use it to plan my next trip.
Written by a motorcyclist with 30 years of Montana experience he describes all of the back roads county by county with great insight and just enough detail. I would strongly recommend picking this book up if you are planning a trip to Montana. The copyright is Oct. 2010 so all the information is up-to-date and very relevant.
http://motorcyclingmontana.com/Enjoy! Great book to get this winter to get your trip all planned out for next summer.