To bring back the subject... there's a fairly nice mildy fictionalized biography of Leonardo from the point of view of one of his apprentices titled _The Second Mrs. Giaconda_; it's aimed at a young adult audience, but is a good deal of fun to read; it's by E.L. Konigsberg, who wrote a number of other good young adult books.

Chocolate Pi (who should be writing midterm essays now, since I'll be singing all weekend at the Midwest Sacred Harp Convention)