Here's a publisher who knows how to use ebooks: (1) Let the public examine the entire book. (2) a poster came from page 133.

Here's the link.
http://www.stenhouse.com/shop/pc/viewprd.asp?idProduct=9718&r=sb10t132



Go ahead.  Look at the book.  The entire book.  It's possible to take screenshots, but who would spend so much time to avoid buying a book?

On the next page, I read the lines that inspired the poster: "Reading is breathing in.  Writing is breathing out.  Let's breathe."

Nice balance between "open access" and "if you want it in your hands, pay for it."