The book is not currently available in ebook form. I am not sure if there are plans to make it available as an ebook. You might want to contact Packt Publishing Support to inquire about this.
David
Author, <a href="http://www.packtpub.com/java-ee5-development-with-netbeans-6" target="_blank" rel="nofollow">Java EE 5 Development with NetBeans 6</a>