Mark Twain’s Writing Tips: Solid gold.
Bend Word to Your Will: Ya gotta love the title. For power users who know what they don’t know and want to learn it.
New York Times After Deadline: Notes from the newsroom on grammar, usage, and style.
OneLook: The mother lode of dictionaries
Thesaurus: What else can I say?
Duotrope’s Digest: A free resource listing 2900+ current fiction and poetry publications.
Purdue University’s Online Writing Lab: The ne plus ultra for APA/MLA formatting rules
Ten Writing Tips that almost everyone will find useful.
Agent Query: The largest, most current searchable database of literary agents on the web.
The “Basic Plots” in Literature: How many are there? Well, it all depends…
Writer’s Market: Where and how to sell what you write. Paid subscription.
Word FAQs: A bunch of interesting information about words. Seriously. Very entertaining.
Wordiness List: Help for the prolix.
Kuler: In case you’re tired of cat videos. Thank me later.
Author Support: Cover art, web design, marketing materials for writers. Beautiful work.