In two weeks, I’ve read more novels on my iPhone 4 than I have in the last 6 months — on purpose, and not because I’m writing about electronic books right now. As I stumbled into this, I was pretty sure I wasn’t going to care that much about them. I downloaded an iBook sample of the first Lee Child novel about Jack Reacher, a former military police major who drifts across America and somehow manages to get tangled up in all sorts of trouble that requires fists, elbows and guns to get out of.