Tim Sneath has just started an 'Intro to great WPF apps' series starting with the British Library's XBAP for viewing historical books. It's all using bitmaps and not text but it's a very fun app: http://blogs.msdn.com/tims/default.aspx.
"The British Library have digitized the pages of fifteen of their most valuable works and created Turning the Pages, a browser-based WPF application that allows you to interact with these books in a virtual environment from the comfort of your home. You can open a book on your desktop and by clicking on a page, physically turn it in a 3D environment. You can zoom or pan around each of the pages; the page turns themselves are created by modeling the actually deformation of different types of material (for example, a book with vellum pages is far heavier than something printed on paper, so you'll actually see the page start to collapse under its own weight)."