Authors on The Web is an interesting book site with lots of stuff about authors on it. There are sections on the front page about forthcoming titles, and author news. A link takes one through to AuthorYellowPages which is a directory of author websites, though limited by the fact that these aren't collected but dependent on authors taking the initiative. Another link through featured crime/thrillers took one to a mass of info on bookreporter.com where there are reviews (organized by title which I found slightly irritating), a section on books into movies (and DVDs), lists of complete works by authors (rather limited and didn't include Georgette Heyer or Agatha Christie), searching by genre (a try at Science Fiction & Fantasy didn't find Sean McMullen or Paul Collins) and ReadingGroupGuides.
There is a wealth of information about authors here but there did seem to me to be a decidedly U.S. bias to the authors featured. As a U.S. site that is not very surprising. However, I think that as a site it is probably more useful to U.S. public libraries than to Australian ones. But it is good to know about.