As part of today's education announcement, you can pick up a preview of the biology textbook book E. O. Wilson's Life on Earth as a free download from the iTunes store. Requirements for this title are an iPad running iOS 5 and the latest iBooks version, the newly released iBooks 2. Parts of this textbook were demoed during the event this morning.
Included in this preview release is a demonstration of a virtual cell which students can zoom into, a step by step explanation of cell division (accompanied by footage), and a guided tour of a nature preserve.
New chapters of the book will be released in the spring, and eventually the entire book will be available to students (or people interested in biology) everywhere. Final pricing is not yet known.