Free | E book by Vertex
I can't believe these books are free. They contain so much information from such talented and successful people you can't help but be drawn into every page and every caption. A short snippit from their website about the book:
This eBook covers everything from Sculpting, Color Theory, and Texturing and even how to set you up as a successful Freelancer. The book even has articles and workflows from studios such as Naughty Dog and Blizzard Entertainment.
You can download both Volume one and Volume two from Vertex with the link below.