American Society for the History of Rhetoric
The society's goal is "to promote the study of the theory and practice of rhetoric in all periods and languages and its relationship with poetics, politics, religion, law, and other cultural influences."
English Composition: English 214 Course Reader, by Michael John Martin, English Department, San Francisco State University, Spring 2008
Covers the basics of English Composition and Grammar. Good overview to help writers.
English Discourse: English 1301: Composition I Course Content page, by John Stevens, Temple University
Stevens "provides resources for students and open source materials for teachers." This site gets students started with MS Word, Open Office, and the mechanics of writing on a computer.