Google has decided to unify its services by proposing Google Play. This service includes Google Music, Google Books, Google Movies and Android Market. A kind of iTunes without software to install.
All this is currently only available in the United States. Only Android Market is integrated into Google Play in Europe. Google Play also provides the Cloud to users. This will enable you to install your applications on difference devices and especially to synchronize datas between your devices without the need to connect together. Start your book on the web then continue reading on tablet or smartphone. Of course, it's also possible for movies.
Google offers many promotions for the launch of Google Play.
Here is the video presentation of Google Play :