This week I spent some time watching the online video, The Library of Congress: Pursuing Your Family History in the National Library. This video is free and available from the Online Classes section of the Family Search website. I highly recommend watching these videos.
One of the resources from the Library of Congress is a web page from the Journeys and Crossings series that details what resources they have for Amish Resources. This page includes listings of books, periodicals and websites. There is even a webcast with a history of the Amish.
You can peruse more of the Library of Congress Journeys and Crossings pages by clicking here.