On Issuu.com you can find a variety of publications, including newspappers and books.
It offers millions of titles, you can read a lot of them for free, others are available at a paid upgrade. Includes a lot of titles and you can save them in a Watchlist on your account. Also, you can Follow publications that are released with a frequency, to be notified when a new edition appears.
Allow users to upload and share their publications, too.