The Futurians - http://ebbs.english.vt.edu/20th/etudes/anderson/futurians.html Group of New York SF fans, writers and editors active from 1938-45. They held the conviction 'that SF fans should be forward-looking ("futurian") and constructive. Site presents a brief overview of the group.
Revolutionizing the Genre - http://sharon7210.tripod.com/scifisites/ Dedicated to Samuel R. Delany, Octavia Butler and Nalo Hopkinson - three black writers of science fiction.
SFF Net People - http://www.sff.net/people/ Large collection of links to individual author sites, sorted alphabetically.
The Calgary Coven - http://www.sff.net/people/asinclair/covenc.html SF/F authors Rebecca Bradley, Mari Jakober and Alison Sinclair's joint home page.
Fantastic Fiction - http://www.fantasticfiction.co.uk Bibliographical index of around 2000 science fiction and fantasy authors.
Sci-Fi Authors Fansites - http://www.geocities.com/stevenerikson2002/index.html Small fan site for authors, David Gemmell, Steven Erikson, Ian Graham and Gareth Wilson.
SF Site: Science Fiction Author Links - http://www.sfsite.com/scribe/scribe01.htm Collection of author links, sorted alphabetically for convenience.