"Google Books are no longer available via Reader Store"
The 'Google Books' button no longer serves up Google books (I last used it just a few days ago). I will miss that feature, and am perturbed that they have removed it.
Interestingly, I typed 'm.books.google.com' in an attempt to discover if Google Books has a mobile web interface. This was redirected to 'www.barnesandnoble.com'! (I just tried it on my desktop browser: same result.) That's pretty odd...