DeeKaye sums up the reasons for Napoleon's downfall over at the Napoleon Bonaparte MSN discussion group.
So, as we have seen, Napoleon was the author of his own misfortune. His ultimate aim, to forge a "United States of Europe" living at peace with her self, and benefiting from that peace, would one day be realised, as he mused during his exile at St.Helena. He also warned the European Continent to beware of China, "The sleeping giant", and who is to say that he was wrong?
UPDATE 13/04/2005: To all the brainless morons saying "This post didn't help me at all" - go read a frickin' book. OR... wow, here's a zany idea, if you have a question about Napoleon, why not send me a nice email? I might even help ya.
UPDATE 06/04/2006: check out the Napoleon podcast for in-depth information on Napoleon's rise and fall!