This website has a lot of novels and short stories available. This could be a really valuable resource in a school that might not be able to afford as many books.
This wiki entry is from a teacher and it gives several ideas on how to explore American Romanticism. It also gives some more in depth information on Edgar Allan Poe.
This site has lesson plans and resources that are useful for any English teacher. It not only covers literature, but grammar as well. It also has a section on AP.