Having been an English Literature major in undergraduate study, I have *some* familiarity with the difficulties that may arise when attempting to write something, especially something really brilliant.  Here are a collection of links, which I think any writer might find useful.  Good luck!

The Everyday Writer - Got me through many a paper in it's tabbed book form.  This online resource includes special instruction for online writers.

Merriam-Webster Online - A simple Collegiate dictionary and thesaurus combination search box.

Spellcheck - While Word programs have spellcheck, many web publishers such as Yahoo! Pagebuilder, do not.  Paste the text (up to 5000 characters) into this site, and it will check for errors.

Bartleby.com - As a firm believer in the well placed allusion or quotation, I recommend John Bartlett's 1919 collection of familiar quotations as fully searchable and thorough.

19th Century Slang Dictionary - I enjoy writing period fiction.  This website contains a catalogue of period fiction--including curse words, so please be advised it might not be suitable for all ages.

Victorian Era Names - Again, useful for the period writer who would like to use period names.  Compiled from census data and vital statistics records.

Old West Slang - More useful period era information.  This time useful for Westerns.  Drawn from period books, memoirs, and newspapers.

Babelfish Translation - Occasionally it's fun to add a little foreign touch to your writing.  This tool automatically translates both ways in many languages.

Amazon.com - I think the more you read, the better or more informed your writing is.  Your vocabulary and grammar will improve, and picking up on the subtle differences in voice might help you find your own.

1001 Free Fonts - What better way to dress up a title than by downloading a fun new font?