Ok, as long as I added a review for my mom's book, I really should include my dad's book too.
This book takes the knowledge of the top spinnning wheel nerds in the US (4, by my last count) and compiles it into an illustrated field guide. You can learn how to identify different spinning wheel types and makers, styles of wheels and regions of origin, and what all the bits and pieces of textile tools are used for. If you truly have interest in spinning wheels, just leafing through the pages of photos may make you drool.