Science Fiction and Fantasy Writers of America – Even if you’re not a member of this professional organization for science fiction and fantasy writers, the website provides tons of information, on everything from standard manuscript format to how to avoid literary scams.
Writers of the Future – A quarterly contest for amateur writers that has produced an incredible number of today’s bestselling science fiction and fantasy authors. Definitely worth entering if you like to write short or even novelette-length stories. The forums are a great place to meet and learn from others entering the contest, as well as past winners.
David Farland – Bestselling author David Farland teaches some fantastic workshops. You can register here for his “Daily Kick in the Pants”, which will send free writing advice and inspiration to your email nearly every day.
Superstars Writing Seminars – An amazing seminar that teaches the business of writing and how to make a career of it. Highly recommended.
Query Tracker – Looking for agents? Here you can find searchable lists and keep track of your queries and results. The site offers a paid service that provides more features, but even just using the free portion of the site can be quite helpful.
Publishers Marketplace – TONS of information on agents/editors/publishing houses. There is a subscription fee for full access, but the near-daily emails provide a great way to keep aware what’s happening in the literary world (though there’s so much information it can feel overwhelming at first).
The Inkbots – I belong to this writing group and love them all to pieces. But not in a creepy serial killer kind of way.