All Sci Fi - contains sci-fi book reviews, message boards, and discussions

Definitions of Science - offers a wide range of definitions on science fiction.

Fantastic Fiction - has bibliographies for thousands of authors, awards, forthcoming books, and a comprehensive series list.

Locus Online - contains a complex index of science fiction materials as well as perspectives on fantasy and horror.

SciFan - is a website intended for readers to learn about new science fiction books and authors. The site is categorized by themes, author, and series.

The SF Site - features sci-fi links, reading lists, forthcoming books, reviews and much more.