National Writers Union - http://www.nwu.org/
The trade union for freelance writers, maintains an impressive site including the latest news regarding writers' salaries, contracts and related legal issues, a Job Hotline, the American Writer magazine, and an annotated directory of online resources for writers.
Poets & Writers Online - http://www.pw.org/
The online version of the Directory of American poets and fiction writers contains almost 4,000 names and addresses (including e-mail, if available) of writers and is enough to make this a unique resource. The Literary Links and Great Resources are invaluable for professional and amateur writers and help to make this not-for-profit site one of the premier gatherings of literary information on the Web.
Purdue On-Line Writing Lab: Handouts for Students - http://owl.english.purdue.edu/handouts/index.html
More than 100 documents on writing skills, in such catagories as: Writing in the Job Search; Punctuation; Parts of Speech; Spelling; and English as a Second Language.
Rongorongo of Easter Island - http://www.rongorongo.org/
This site provides a corpus for Rongorongo, the writing system on Easter Island. Being the only known pre-twentieth century written language in Oceania and one of the last languages which remains undeciphered, scholars continue to debate the meaning of the glyphs or signs. For a detailed discussion, read the commentaries of leading figures such as Sergei V. Rjabchikov, Jacques B.M. Guy, and Steven Roger Fischer.
Style Sheet for Citing Internet Sources - http://www.lib.berkeley.edu/TeachingLib/Guides/Internet/Style.html
Answers the questions, MLA style.
Writer's Guidelines Database - http://www.writerswrite.com/guidelines/
A database of general guidelines for paying, non-fiction writing from more than 300 magazines, which define the scope and subject matter of articles they publish.
Writers Guild of America - http://www.wga.org/
Resources for the general public, screenwriters, and for members of the Guild writing in film, radio, television, and now in interactive media. Features include: The Craft of Screenwriting; Tools of the (writing) Trade; and Interactive Writing - how it's done.