You know, this really IS a very good idea for Google. It will popularise their platform and probably engage LOTS of readers just as they are transitioning to ebooks. Might even help them sell some of those new ereaders they’ve launched!
Its no surprise that Pottermore has turned to Google to run what is bound to be a wildly popular e-commerce site. How well this deal will help boost Googles own e-bookstore efforts, beyond just sales of the Harry Potter titles, remains to be seen. No doubt Google hopes to be able to lure fans and book-buyers in to its e-bookstore for all their reading needs.