http://owl.english.purdue.edu/sitemap/
The Purdue University Writing Lab and Purdue Online Writing Lab (OWL) assist clients in their development as writers -- no matter what their skill level -- with on-campus consultations, online participation, and community engagement.  The Purdue Writing Lab serves the Purdue-West Lafayette campus and coordinates with local literacy initiatives, while the Purdue OWL offers global support through online reference materials and services.

http://www.merlot.org/merlot/index.htm
MERLOT is a leading-edge, user-centered, searchable collect of peer-reviewed and selected higher education, online learning materials, catalogued by registered members and a set of faculty development support services.  MERLOT's vision is to be a permiere online community where faculty, staff, and students from around the world share their learning materials and pedagogy.

http://writing.wisc.edu/Handbook/Assignments.html
Common types of writing assignments.

http://leo.stcloudstate.edu/#online
LEO provides online handouts about a variety of writing topics.

http://english.ttu.edu/uwc01/OWL/writing_elements/elementsreviewframe.asp
The Twenty Common Errors from Lunsford's St. Martin's Handbook.

http://bcs.bedfordstmartins.com/exercisecentral/exercises.html
A free and open collection of Web resources for the writing class.  Here you'll find plagiarism tutorials, model documents, visual analysis activities, research guides, bibliography tools, and much more.