FDR's New Deal Websites
Presidential Library
The Franklin D. Roosevelt Presidential Library and Museum has digitized portions of its massive collection of FDR documents and made them available to the public at its website. A great collection of primary sources from FDR's presidency, including his fireside chats and a considerable trove of images and audio-visual clips.
Social Security History
Social Security was the New Deal's most important lasting contribution to American society; the Social Security Administration, created by FDR and Congress in 1935, maintains a very detailed website chronicling its own history.