Slacker's Sci-Fi Source
News and reviews, games, message board, contests, and postcards.
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http://www.scifislacker.com/

Society for the Furtherance and Study of Fantasy and Science Fiction
Supporting literary and fanzine fandoms in Madison, Wisconsin. Host of WisCon, a feminist science fiction convention, and other events.
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http://www.sf3.org/

Solar Flare Science Fiction and Fantasy
News, reviews, polls and discussion centering around literature, television, and movies of the genre.
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http://www.sflare.com/

Spacescape
Based on an original story intended for television, this site describes a fictional community in space.
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http://www.spacescapeweb.com

Speculative Vision
News feed updated monthly. [RSS]
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http://speculativevision.com/scifi_news/news.cdf

Steampunk
Includes a large collection of reviews, author information, and interviews.
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http://www.steampunk.com/

StupidSciFi.com
Science fiction news and entertainment. Forums and reviews.
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http://www.stupidscifi.com

SyFy Portal
News on the genre with a focus on Star Trek. Newsletter and chat.
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http://www.syfyportal.com/

Technovelgy
Inventions from books and movies, listed alphabetically, divided into categories, or searchable by author.
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http://www.technovelgy.com/index.htm

The Eternal Night
Bibliographies, book reviews, current news, and television shows and movies categorized by theme, covering science-fiction, fantasy, and horror. Also, e-zine featuring short fiction, interviews, and forums.
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http://www.eternalnight.co.uk/