Lynch's Online Guide to Grammar and Style http://newark.rutgers.edu/~jlynch/Writing/

The Elements of Style by William Strunk, Jr.
http://www.bartleby.com/141/
(get the revised edition by Strunk and White when you're offline)

Never Say Neverisms - Self-illustrating Rules
http://www.mapping.com/never2.html

Grammar Rules Refuted
http://www.ojohaven.com/fun/broken.rules.html
(Especially suited for the jeering grammar snob)

Linguistic Terminology
http://www.csi.uottawa.ca/~kbarker/ling-devices.html

Orwell

Politics and the English Language by George Orwell
(click here for text version)

Propaganda and Demotic Speech by George Orwell
(click here for text version)

The Grammar Monkey will be hosting Theory and Criticism until further notice.

(some monkeyish thoughts on)
Theory and Criticism

Dr. Hedge's Resource Center:

A thoughtful (and amusing) look at the following:

Timeline of Major Literary Criticism
Taxonomy of Feminist Intellectual Traditions
Major Periods & Aesthetics in US Literature
Deconstructionism
New Criticism
New Historicism
Queer Theory