It is pretty amazing the amount of information on historical figures there is on the internet. I think this will be one of one of the legacies of the net, it the tremendous documentation (good and bad) that is going on.

Here are some sketches by Leonardo da Vinci
http://visi.com/~reuteler/leonardo.html

Personally I really like the gradations from the 16^th century
http://visi.com/~reuteler/vinci/world.jpg

da Vinci Code Trailer 2
http://www.apple.com/trailers/sony_pictures/da_vinci_code/

Digitized: The Notebooks of Leonardo Da Vinci
http://www.gutenberg.org/etext/5000

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Da Vinci The Inventor
http://www.damninteresting.com/?p=185
http://www.damninteresting.com/?p=187