Free
Drink Responsibly !
The Bluffer's Guide to Wine (The Bluffer's Guides) by Jonathan Goodall
An excellent series, often both truthful and witty.
Jonathan Goodall is currently a columnist for The Financial Times.
http://www.amazon.com/dp/B00B0SSSGY/
http://www.amazon.co.uk/dp/B00B0SSSGY/
http://www.amazon.ca/dp/B00B0SSSGY/