This site would be useful in the American Literature classroom because there is a ton of information on various literature. Students could find information about early American Literature, women authors, as well as poetry. I have actually used Paul Reuben's site (which is included in a link on this page) for my American Literature classes. There's a lot of background information teachers can use to help instruct students on the literature (criticism, interpretations, etc).
This site would be extremely useful for history teachers when teaching about Vietnam. There are letters, maps, as well as first-person accounts from people who were in Vietnam.
This site provides information about poets and their poetry that Literature/Language Arts teachers could use in their classrooms. There are links to specific poets, such as Ted Kooser and Walt Whitman, as well as a link to recorded poetry. Students could research poets, they could listen to poetry, or they could read poetry on this site.
This site provides information that teachers from many different disciplines could use in their classrooms. There's information about literature, the environment, immigration, as well as culture and sports. There's also a link specifically for teachers where they can get lesson plans and ideas for their classroom.
This site offers many primary sources and documents from the Holocaust. It also provides teacher resources teachers can use to teach their classes about the Holocaust.
This site has information on tribes from the United States, primary sources. and lesson plans teachers can use when teaching about the Native Americans.
This site offers lots of documents and information about the Salem Witch Trials. I use this site in my American Literature class when we are reading "The Crucible".
This site includes material about famous Americans. This site would work for any reports about presidents, about authors, or about musicians. It would also be helpful when researching the various states. As an American Literature teacher I would use the site to have students research Langston Hughes, for instance. That would also be a great source for Black History Month.
This site provides first-person accounts from former slaves. I have actually used this site in American Literature to show students what slaves went through. It gives them a voice and students have really connected with the slaves' stories. Students can find lots of material about slavery, but the first-person accounts make it much more personal.