I found this at Quill and Quire and felt bookstore owners and others here should be kept up to date on the trends involving, in my opinion, soulless objects that are kindles and iPads etc.
My opinions aside, the sales info and privacy issues explored in the article are important facts.
To read it go to:
http://www.quillandquire.com/blog/index.php/2011/01/31/digital-books-at-the-tipping-point/