I just finished "Yoko" by David Sheff. I can't recommend it enough. It is brilliantly written with great respect for Yoko - and oh, that cover - just gorgeous! I thought I knew a lot about her, but Sheff has enlightened me to much information I was not aware of. I can also highly recommend Madeline Bocaro's book, "In Your Mind - the Infinite Universe of Yoko Ono". It's great to see Yoko finally getting the attention her life and work deserve.