well, i guess some might call me the resident conspiracy theorist.
i wasn't there so i don't really know what happened but, history is usually written by the victors and more often than not, there is more to the story than what is written. Robert Stinnett researched the National Archives via the Freedom of Information Act and according to some, did some very in depth research. he wrote a book called, "Day of Deceit".
actually, i managed to find an article that can spell it out better than i can, so i will just link that. from 2002:
Do Freedom of Information Act Files Prove FDR Had Foreknowledge of Pearl Harbor?