I wholeheartedly second the Murakami book recommendation. It's really nice how he talks about being a hardworking writer in a very personal and unglamorous manner. The analogy he draws with running is also very thoughtful.

How (or does) this relate to ADD and ADHD? Can ADD be trained away? I ask this seriously, I personally think our ability to literally change our minds is not well understood and extremely underestimated.