Digital books are easier to search, weigh a lot less, are far easier to store. My only gripe is that to replace your paper books with digital versions you have to "buy" them all over again. And by "buy" I mean purchase a lease on them, as you only get the rights to look at them for a short while (unless they're in an open format) or until the entity you get them from suddenly turns round and says that you are not allowed to have them any more. For example if you don't give them a greater share of your royalties, or if you fail to use NCX protocols or because the government/council/school suddenly turns round and says that this book now contravenes their rules. Oh, and also in the UK, books are VAT free. Electronic versions are not. It's only the fact that a lot of publishers have opted to give a 20% discount to most books to make them competitive, but thats not always the case.