This is a great article from UX Magazine. It does a great job defining interactivity and gives video examples of eBooks and eBook apps that have value.
This app allows you to have full text-to-speech capabilities with eBooks on your iPad. Any book in the public domain can be read and listened to in one app.
This app goes with the FREE service provided by littlebirdtales.com. Students can create stories with their own artwork and audio recordings either from an app or on the web. The completed tales can be downloaded as either a PDF or mp4 with audio.
This free eBook is available for download and provides a great interactive resources. Each section ties into some aspect of Bloom's Taxonomy and provides additional information to support iPad integration into the curriculum.
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.
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 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.