Listed below are several general research sites for students of American Literature:

PAL: Perspectives in American Literature by Paul Reuben.

American Literary Sites by Donna Campbell.

American Literature on the Web by Akihito Ishikawa.

American Literature from Voice of the Shuttle.

All American: Literature, History, and Culture Ed. Mark Canada.

Lectures and Links from Princeton U.

Wright American Fiction, 1851-1875 from Indiana U.

American Literature (1700-1800) Reason and Revolution from ISLMC.