This is an incredible app for students with special needs. It connects to the Bookshare.org database and does require a membership ID. However, students and organizations who qualify have access to a tremendous resource.
"From within Read2Go, you can browse, search, download, and read books directly from Bookshare using your Bookshare membership, as well as read DAISY books from other sources. The app gives you full control over visual choices for font size and color, background and highlighting color, and text-to-speech preferences. Read2Go features word-by-word highlighting for multi-modal reading."
The Virginia Department of Education helped to create this list of apps for students. You can download them from the Apple App Store. Some of them include digital texts from Pearson publishers.
This is a great review of a standard app - iBooks. It also includes a link to a great podcast about alternate ways to integrate iBooks into the classroom
This is a great article about the evolution of reading. Given the influx of iPads and eReaders into classrooms, the concept of "books" is certainly changing.
This app is free until April, though know that some content becomes an in-app purchase. Bookabi allows students to create their own storybooks with 2D and 3D characters. They can upload their own photos and pictures plus save and share their final projects.
This article from I Education Apps Review lists out a series of apps to use for creating custom digital content. Not all are free, but the list presents some interesting options.
The LitCharts Library provides chapter summaries to some of the most frequently read books in high school English curricula. It also features an iPhone App for reading. Teachers should be aware of this site as it bills itself as "the faster, downloadable alternative to SparkNotes."
This is another online ePub converter. By uploading a Word, PDF, or other text file, you can convert that file to an ePub format for iPad, Kindle, etc.