Zero. I guess I'm an outliner.
Books that just give information (especially techs) are replaced by the Internet. Other books are supposed to teach me something, but my experience is that I learn stuff by doing and thinking rather than reading.
I agree, and I also learn the most from doing and thinking, but programming books gives me perspectives and ideas to think about, discuss, and try/do.
Of course, whatever works for you works for you.
Whenever I think about consuming information, I always first consider the half-life of that information (another reason why I rarely spend time keeping up on the news).