Guide to Grammar and Writing
Charles Darling's very large, helpful resource. Lots of quizzes--lots of everything.

Writing Center
The University of Minnesota Department of Rhetoric site is especially good for its interactive writing exercises.

The UVic Writer's Guide

Purdue Online Writing Lab Writing Handouts
The oldest online writing lab. Excellent handouts.

WWW Resources for Rhetoric and Composition

The Curmudgeon's Stylebook
Good for answers to word choice questions.

English Grammar Hotline at MSU

Paradigm Online Writing Assistant

Jonathan Revusky's Interactive English Grammar

Ask the Writing Consultant (Univ. Wisconsin-Madison)

Email Miss Grammar
Send her your grammar questions at moodwick@protrainco.com.

Grammar and Style Notes

Punctuation

Punctuation (HyperGrammar)

Writing Lab Exercises

alt.usage.english FAQ

Editorial Eye

The Write Site
Independent online writing lab.

Inkspot: Writers' Resources on the Web
Writing forums, Inklings newsletter, writing market news and tips, contests, and lots of information about the "craft" of writing.

Resources for Writers and Writing Instructors

Writing Papers of Literary Analysis

Writing Paragraphs (HyperGrammar)

WordNet
Good interactive thesaurus.

Words'R Us

Writing Strategies

Common Errors in English
it's vs. its, affect vs. effect, use to vs. used to.

Active Voice
Good Quick Tips For Better Writing section

The Passive Engineer
Miss Grammar's reasons why you should avoid the passive voice.

MAMA's Hot 100 Grammar and Usage Goofs
.

William Safire's Rules for Writers
Examples of what NOT to do in simple sentences explaining what TO DO.

11 Rules of Writing

Literary and Rhetorical Terms (UVic)
Great for AP English.

Creativity Web
Ideas and techniques to get you thinking.

Word Wizard

@writers
Writers market, writers chat, and a newsletter you can subscribe to.

Word by Word
Anne Lamott's online diary for Salon magazine.

Writing Advice
Articles by Michael Banks