Have a look at Lookybook

Lookybook was selected by Time Magazine as one of the 50 best websites of 2008.

"Our mission is to create a comfortable place where a curious and devoted audience can search, view, talk about, and buy from a diverse and rapidly expanding collection of picture books. We intend to create the greatest opportunity for authors, illustrators and publishers to reach interested consumers and dramatically extend the life of their books. Lookybook currently features over 300 titles and is growing daily."

I'm impressed by the ability to embed mini books, like the baseball book above. What a great way for teachers to share their favorite books, or books that were read in class with parents. The website creators acknowledge that this site is not meant to replace the actual experience of holding a real book and turning the pages, but it sure is a great way to preview books for later purchase or to check out at the library.