jcroach has some GREAT suggestions above... go with them.
I want to highly recommend "The Ultimate History of Video Games: From Pong to Pokemon--The Story Behind the Craze That Touched Our Lives and Changed the World"
It isn't as in-depth as some gaming books I've read, and it's a bit dated now as far as "current generation" stuff goes, but it is an excellent read. You hear the story from the people involved, and its very well laid out.