Welcome to the Dowse archive for writers, artists and other creative people. Although no new material is currently being added to the site, Dowse remains a valuable resource (effectively an archive) of hundreds of pages of articles, fiction, reviews, links and so on.
Check the large Dowse --> Science Fiction directory within also.
Book Jetty allows you to catalog, rate and review books, check availability through libraries (from 11 different countries), discuss books with firends, display on your blog
Titlz intends to provide data and trends on the book publishing industry - historic data, sales rankings on books on Amazon, trends on topics and titles. Although still in development, book industry professionals can currently use TitleZ for free.
Noovo has just come out of private beta. It works as a lifestreaming blogging aggregator. Add bookmarks, video, audio, text, quotes, clips, images - everything. Also use the Noovo technology to get recommendations for more content on your interest topic.
More features than Tumblr, however slightly harder to use.