Armitage House: Publishing arm of Pagan Publishing that publishes Lovecraftian themed fiction and non-fiction books.
Author Services, Inc.: Contains information about the works of author L. Ron Hubbard.
Baen Books: Primarily SF publisher. Site geared to readers and writers, with submission guidelines, catalog, samples, and discussion groups. Founder Jim Baen was the longtime editor of Galaxy magazine during the '70s.
Chaosium, Inc.: Publishes Lovecraftian and Cthulhu Mythos fiction.
Del Rey Books: SF and Fantasy publisher Del Rey, with online catalog, collections of related links to authors, interactive online writing workshop.
EDGE Science Fiction and Fantasy Publishing: A publisher specializing in trade paperback and hard cover book-length science fiction and fantasy literature.
Jump'N Jupiter: Publisher of science fiction and fantasy books, art, and collectibles.
Keeper and Sol Publishing: Publishers of "The Mars Transmission," a novel about a mission to Mars in 2009. Includes excerpt chapters from the novel and author page.
NESFA Press: NESFA Press is the publishing pseudopod of the New England Science Fiction Association, Inc.
Pariah Online: Pariah is a web based magazine crafted with an eye on the classic style of science fiction and fantasy. Submissions accepted for peer review.
PS Publishing: UK-based publisher of collectors edition novellas, novels and fiction collections by new and established authors.
Sense of Wonder Press: Publishes science fiction, fantasy, and horror titles as well as genre related reference books including biographies, film books, and titles relating to other aspects of these fields.
Silver Age Books: UK based small press publisher of science fiction and fantasy.
Sweet Mischief's Press: Publishers of the chronicles from The Scrolls of Dust beginning with Embrace the Boogeyman.
Time Warner Books, Inc. - Aspect: Promotional pages of the science fiction and fantasy division of Warner Books.
Tor SF and Fantasy: A promotional/corporate information page for the publisher; also includes to further sf author- and publisher-related resources on the 'net.
Tyrannosaurus Press: Small press in based in New Orleans, LA that focuses primarily on works of science fiction and fantasy.
White Wolf: In addition to role-playing games, White Wolf also publishes some fine SF and fantasy, generally under their Borealis imprint.