Indiana Purdue university writing lab offers explanations as well as ready made materials for teaching and learning
writing. Tutors respond to brief questions sent to the owl@owl.english.purdue.edu address. Highly recommended.
http://owl.english.purdue.edu/lab/owl/index.html

This site available with restrictions to non-subscribers is good for guided writing practice. It is interactive and is process-focussed rather than product –oriented with help messages provided throughout the various writing stages.
www.essaypunch.com

Simple creative writing and oral storytelling activities with copyable handouts for use with students of all ages.
http://www.uoregon.edu/~leslieob/pizzaz.html

Paradigm is an interactive, menu-driven, online writer's
guide designed to benefit novice as well as experienced
writers. Written by Chuck Guilford an associate professor of English at Boise State University,
http://www.powa.org/about/index.html