Free cloud storage with Copy--works similar to Dropbox -- free and 15 GB of storage. (I use Dropbox and see no need to change, but this has an app that you can install on any device and, apparently, is not in conflict with Dropbox). Might be worth a book.
Free apps to celebrat National Reading Month. Auryn, Inc. will have a free interactive reading iPad/Phone app each day of March. Worth your time to look.