Does anyone who is into reptiles buy books anymore? I am mesmerized by how many "reptile" people nowadays don't own the Peterson Field Guide for Reptiles and Amphibians of Eastern & Central North America. And before you all lambaste me I am not talking about people trying to get an ID, I am talking about people who post online (here at kingsnake and elsewhere) and keep snakes themselves. Field Guides are chock full of information that has been accumulated from decades of studying by professional herpetologists. They include range information, average sizes, record sizes, habitat, descriptions, subspecies, habits, and other natural history information. It is much better than finding everything out by googling or trying to find decent information on the internet.
Just my two cents.