This book is partly a biography and partly the autobiography of Linus Torvalds. But it is not really detailed enough to qualify as a very good biography. (I suppose writing the life of a 32-year-old is a bit premature anyway.)
It is also partly the story of Torvalds' brainchild, the Linux operating system. Again, though, it is not really detailed enough, neither in the technical description of Linux' birth and growth nor in the discussion of the system's role in today's computer industry, to seem complete.
So you don't really get the full picture of the man, nor the full picture of Linux. What do you get? Well... Something about Linus' childshood and familiy, the image of a lonely hacker behind drawn curtains in a tiny Helsinki bedroom, something of Linus' thoughts about Linux; the whys, whens and (sometimes too few of these) hows, and quite lot about Linus' allegedly very prominent nose.
I didn't care very much for the first parts of this book. The switches between Linus' own account and David Diamond's narration are not very smooth. Also there is far too much of the story of the story. (I'm not really interested in what car David and Linus drove down what California highways.)
The strenght of the book is that although the autobiographical parts may leave something to be desired, they draw a sort of picture of a clever and strong-minded person, and a very nice guy thet you feel you know a little better after this read.
BTW, the book has no pictures whatsoever, not even a portrait of Linus' with his much-described nose on the cover.