Really thorough discussion of parts of the essay:
http://www.wwnorton.com/college/english/litweb05/writing/welcome.asp
Purdue's OWL has a pretty good over--basics:
http://owl.english.purdue.edu/owl/resource/618/01/
Nine easy step? Really?
http://www.unc.edu/depts/wcweb/handouts/literature.html