We are using the same book I've been using for the past 3 years - only it is 'electronic' now. The book is:
Project Management in Practice (eBook) 3rd edition, by Samuel J., Jr. Mantel, Jack R. Meredith, Scott M. Shafer, Margaret M. Sutton, Wiley Publishing
ISBN-10: 0470121645, ISBN-13: 978-0470121641. For eBook ISBN 0470499419
Paperback $79.99 (was $100 but just dropped because 4th ed released); eBook $52.50
We are currently using the eTextbook App from CourseSmart to access the book from the iPad. We can also access the book through the CourseSmart website from any PC/Mac. There are several limitations of the eTextbook App (re: no highlighting) that I'll talk about in more detail in a future post.