Utoo said:Check out this forum:
http://forum.interference.com/f193.html
My personal suggestions would be:
1. Unforgettable Fire by Eamon Dunphy for early stuff (don't believe people who tell you it's no good--it's a great resource & all criticisms are based on one article from 1987)
2. U2: At the End of the World by Bill Flanagan for ZooTV-era U2
3. Bono: In Conversation with Michka Assayas by Michka Assayas for a great insight into modern Bono