I agree with _Rahul that ideas are born from cross-polination. I read a lot of business books and blogs, but also read other stuff - novels, science, faith-bas

I agree with _Rahul that ideas are born from cross-polination. I read a lot of business books and blogs, but also read other stuff - novels, science, faith-based, humor, etc. Most of my ideas come from combining something that I've read from a business book/blog with something completely unrelated. Also, something else that helps cross-polinations is traveling to developing countries. Oftentimes, there are so many new experiences, points of view, and ways of doing things there that it opens your mind. To document my ideas, I just type them in Notes on my iPhone.