“I pledge you, I pledge myself, to a new deal for the American people,” Franklin D. Roosevelt told supporters in 1932 while accepting the presidential nomination. When he took office the following year, he spent his first 100 days enacting a dizzying number of reforms designed to stabilize an economically depressed nation. Since then, a president’s first 100 days have been an indicator of what he is able to accomplish. In January 2009, the clock starts again.
this is a really cool chart detailing the first 100 days of each president since FDR...if you can't see it big enough here, click here.