PBS
Pbs: The American Novel: Literary Timeline: Novels: 1939: The Grapes of Wrath
Introduction to John Steinbeck's The Grapes of Wrath. Highlights main ideas and themes of the novel.
Varsity Tutors
Varsity Tutors: Web English Teacher: John Steinbeck
This site features lesson plans for several of John Steinbeck's books. Not surprisingly, most resources relate to "The Grapes of Wrath."