Litblogs?

Despite the fact that they arguably pre-date anything mentioned in the article, The Guardian fails to mention litblogs in this "books on the web" piece.

The web revolution that is turning whole industries from music to television upside down has been slow to reach the cosy world of books - apart, that is, from the pioneering bookseller Amazon. Not any more. Interesting things are happening on a variety of fronts that are changing the way books are found, read and talked about, and in almost every case for the good.