U2 by U2 a Great Read
Although I'm a huge U2 fan I was still incredibly surprised at how much I enjoyed the book. I found their approach and the group dynamic described incredibly interesting.

Definitely worth the money if you're a fan.
Their is also plenty of interesting photography much of which is from Anton Corbijn.
"Anton Corbijn was a person whose own vision would seriously impact the band's. His pictures are often very monumental, whereas the band certainly were not. We were very stoic, it was a very aesthetic time, Anton took pictures that looked like the music rather than the musicians." - Bono

Definitely worth the money if you're a fan.
Their is also plenty of interesting photography much of which is from Anton Corbijn.
"Anton Corbijn was a person whose own vision would seriously impact the band's. His pictures are often very monumental, whereas the band certainly were not. We were very stoic, it was a very aesthetic time, Anton took pictures that looked like the music rather than the musicians." - Bono