Just picked up Arthur M. Schlesinger, Jr.'s FDR biography, and lo-and-behold, he starts with FDR's swearing in. Apparently, before FDR, President's would just say "I do", but FDR memorized it ahead of time and was thus the first to repeat the entire oath instead... (makes Obama look overly cautious for doing it twice...)
As for FDR, the Great Depression, and being overly cautious, I think a consensus has developed among historians and economists that the reason the New Deal did not completely cure the Great Depression was that FDR was overly cautious. Of course, he tried many bold things, but he would always take care not to run up the deficit too much, and would also include tax increases. So while the economy did much better under FDR than under Hoover, FDR never quite solved the crisis because he was just too damned cautious.
Is history repeating itself?