I’ve always had a hard time explaining my position on e-books. Some of my esteemed colleagues are quick to point out the minor dent that e-books have made in overall book sales in this country and others. But when I started evangelizing about e-books back in the late 1990s, we were still talking about what I call the “curl-up factor.” I grew so tired of hearing people complain about not wanting to curl up with an e-book, or the inability to take an e-book to the beach, that as soon as I read either phrase in e-book commentary, I simply …