Writers Groups
This page has a lot of links to great resources for writers. At the bottom of the page is a set of links to a selection of essays from around the web for writers of fantasy and science fiction
Click to join Fantasy_Writing
Yahoo group - Worlds of Fantasy 
This is a really active group with a lot of members. The conversations are active and they have a monthly book reading list. The group is composed of fans of fantasy, self published authors and some professional authors. So they have a good cross section of people.
Science Fiction and Fantasy Writers of America, Inc.
Science Fiction and Fantasy Writers of America site provides information, practical advice, and news about reading, writing, and publishing SF/F
SFF Net 
SFF Net is the world's premier site for genre fiction - science fiction, fantasy, horror, romance, mystery, and young adult fiction. SFF Net is a large, bustling online community of authors, publishers, editors, and - above all - readers.
Millions of individual fans visit SFF Net every month. At any given moment, hundreds or thousands of members are online, taking part in discussions, reading stories, sending email, or chatting.
http://www.sff.net/
Science Fiction and Fantasy Round Table
Welcome to the Science Fiction and Fantasy RoundTable(SM), one of the many Forums of the Dueling Modems community. For over ten years, the SFRT(SM) has been the premier online community for readers and writers of science fiction, fantasy, and horror. Here you'll find exciting new services and familiar, friendly faces.
http://www.sfrt.com/sfrt2.htm
Author Network
http://www.author-network.com/index.html
Internet Research Resources for Science Fiction Writers
http://www.writerswrite.com/journal/jan99/gak11.htm
The Mythopoeic Society
is a non-profit international literary and educational organization for the study, discussion, and enjoyment of fantastic and mythic literature, especially the works of J.R.R. Tolkien, C.S. Lewis, and Charles Williams. Membership in the Mythopoeic Society is open to all scholars, writers, and readers of these literatures.
http://www.mythsoc.org/
The SF&F Online writing workshop
http://sff.onlinewritingworkshop.com/
Fiction Factor The online magazine for fiction writers 
http://www.fictionfactor.com/fictionfreebies.html
Book Surge Publishing Publish Your Book Today See your science fiction book for sale on Amazon and available to bookstores in just 4 weeks.
http://www.booksurgepublishing.com
e-booktime The Science Fiction Publisher For You Science fiction publisher offering affordable, fast and easy publishing service. Get published in print and ebook. Earn high royalty. You keep rights.
http://www.e-booktime.com
SciFi Editor.com -- Serving Writers, Literary Agents, and Publishers Since 1976 --
Aliens / Alien Abductions / UFOs, Alternate Worlds, Alternate Histories, Apocalypse, Fantasy,Feminism, Futuristic Societies, Gender, Ghost Stories, Retold Fairy Tales, Myths and Legends, Shapeshifters, Original Vampires, Parables,
Psi Powers, Religious Science Fiction, Space Travel, Speculative Fiction, Time Travel, Utopia / Dystopia
http://www.scifieditor.com
Canada's National Association for Speculative Fiction Professionals
http://www.sfcanada.ca/
ESSAYS
TOC About Writing science fiction
Menu of articles on writing written by professional SF/F writers.
http://www.sfwa.org/writing/
How to write a best selling fantasy novel
http://members.ozemail.com.au/~imcfadyen/notthenet/fantasy.htm
How to create the fantasy world
http://www.saradouglass.com/createw.html
Writing science fiction links at suite 101
http://www.suite101.com/links.cfm/13402
Writing Speculative Fiction, by Mary Soon Lee
http://www-2.cs.cmu.edu/~mslee/wr.html
Advice For writers of epic fantasy - Thinking big
I also have quite a few articles and tips for writing fantasy - Check out the article list here
