http://www.utc.edu/Teaching-Resource-Center/critical.html
This site provides a review paper on critical thinking, including a bibliography of books and links. The site also offers a section called "Teaching Strategies to Help Promote Critical Thinking" that might lead to better class discussions in literature and writing classrooms.
http://www.dartmouth.edu/~compose/tutor/problems/thesis.html
An excellent handout from the Dartmouth Composition Center. This site looks to have been established for peer tutors in the writing center, and it therefore helpfully overexplains some topics. You’ll appreciate its checklist ("Will your thesis make the grade?"), which includes questions like "Does my thesis sentence attempt to answer (or at least to explore) a challenging intellectual question?" and "Is the point I'm making one that would generate discussion and argument, or is it one that would leave people asking, ‘So what?’" I always find myself asking my students these questions about their writing.
You might also want to check out all the Writing Tutor Training materials available at Dartmouth. The table of contents found here http://www.dartmouth.edu/~compose/tutor/ includes headings/links with titles such as "The Process Approach to Teaching Writing" and "Advice from the Trenches."
http://www.rpi.edu/dept/llc/writecenter/web/thesis.html
This site provides an excellent explanation of the thesis, one from which you’ll feel comfortable quoting liberally in your writing classes. Pay special attention to the "Orders of Knowledge" section: "Mortimer Adler divides knowledge into three classes: statements of facts, statements about facts, and statements about statements." I learned this from Gordon Sullivan and use it all the time.
Online Writing Labs (or OWLs)
http://owl.english.purdue.edu/
The best Online Writing Lab is run by Purdue University. This URL is a great place to start to find helpful handouts on the web. You might call it the Yahoo! of writing resources.
http://owl.english.purdue.edu/internet/owls/writing-labs.html
This is the link (from the Purdue OWL) to about 50 other OWLs.
http://www-english.tamu.edu/wcenter/
This site from the Texas A+M Writing Center also offers a list of OWLs, and some excellent home-grown handouts.
http://english.ttu.edu/kairos/1.1/owls/owlfront.html
This site from the online journal Kairos collects hypertext articles that investigate, theorize, and problematize the OWL phenomenon. Look especially at "Technoprovocateurs and OWLS in the Late Age of Print" by J. Paul Johnson.
http://isu.indstate.edu/writing/handouts/handouts.html
This site from Indiana State University provides one of the best collections of handouts that are ready to be Xeroxed and brought to class. My favorite on creative punctuation use can be found at http://isu.indstate.edu/writing/handouts/setiv/SETIV18.html This is a particularly good site to send students who have a repeated problem with a relatively minor writing issue that does not merit review before the entire class.
Writing and Grammar Links Used by The Hamlet Project
These links, researched and compiled by Andy Jones for a different presentation, are organized in the order in which they might arise in a fictional three-week mini-course on Shakespeare's Hamlet. They are presented roughly in order of importance.