It's by David Sheff.
It goes into a lot of business stuff, like how Nintendo started out as a card manufacturer, how Atari crashed the video game industry, how Nintendo revived it, how Nintendo dealt with companies, etc. It's only current up to the SNES so there's not a lot of stuff about the N64 and nothing about the GC. But they got a lot of inside information, so you get to know about Yamauchi, Arakawa, Shiggy, Howard Lincoln, and other top Nintendo personnel. I'm not quite finished so I don't know yet if they mention anything about Iwata. So far I haven't even seen his name mentioned.
Some of my favorite parts are when they talk about Shigeru Miyamoto and how he came up with a lot of his game ideas. The two chapters about how Nintendo obtained the rights to Tetris are also really fascinating.
I don't know if most people know how Nintendo started out with the NES as far as third parties. Nintendo was pretty monopolistic because they didn't want the same thing that happened to Atari to happen to them. Atari crashed because so many crappy games flooded the market and people stopped buying them. So when Nintendo brought the NES to North America, they set up a system where 3rd parties had to submit their games to NOA and NOA would manufacture the cartridges if they approved of the game. Basically, NOA had all the control over game distribution and they could play favorites with third parties. The third parties started making more games, going for quantity over quality, so NOA tightened the reins even more, making it so that third parties could only make 5 games a year. NOA believed that this would force the developers to make better games. Some companies, like Konami, got around that by making other companies (all the NES games made under the Ultra label, like Skate or Die, are really Konami games). NOA also put a lock-out chip in the NES so that companies who refused to license with Nintendo couldn't make unlicensed games for it. This didn't stop others from trying though. Tengen (a label under Atari) actually stole NOA's copyright on the lock-out chip from the Copyright office and illegally reverse-engineered it so that they could make games that would work on the NES. NOA of course sued them.
Another interesting part is Nintendo's reasoning of why they backed out of the deal with Sony to make a CD add-on to the SNES. It was because if they had made the deal, Nintendo would basically have been out of the hardware business and wouldn't be independent. Sony would have taken over the making of the hardware, the advertising, the tie-ins, and would have received the royalties from the software that Nintendo developed. Nintendo would be doing most of the work while Sony would be making all the profit.
Seriously, there's so much neat information in the book. You should just read it.

I got my copy at Electronics Boutique for $1.99.