Silverlight 1.x Implemented eMagazine.
First annuced：It' implmented by JavaScript，not .net。Silverlight is so at that time. Let's try to underst its' thought.Thought is important than anythings I think.
http://msdn.microsoft.com/en-us/magazine/cc507644.aspx
Demo Show： http://silverlight.net/content/samples/1.0/page-turn/default.html
WPF Book Reader
Aditional, This looks like a cartoon magazine reader.
http://www.codeproject.com/KB/WPF/Wpf_Book_Reader.aspx
A 3D book-shaped application
Creating a 3D book-shaped application with speech and ink using WPF 3.5
This is really is a really good 3D applicaiotn for book reader.
http://www.codeproject.com/KB/WPF/3D-BookWriter.aspx
Aditional, below is not related to book modal.Aha it's a book shelf modal implement by silverlight 2.0
Book Shelf
http://www.silverlightshow.net/Books.aspx