I got an e-mail from David Bodanis this afternoon (author of Electric Universe, E=mc²), referring me to his website and new book, Passionate Minds. It's worth a look; Bodanis is one of the best pop science writers out there.
His book discusses the life of Emilie du Châtelet, a forgotten Enlightenment think, close friends (lovers?) with Voltaire. Bodanis writes at length of Voltaire in E=mc²; this must have been something he intended to do for a while.
The website has excerpts from the book, including the poetry exchanged between Voltaire and du Châtelet.
Bodanis is busy promoting, but said he might be able to answer a few questions. Keep an eye out for a short interview (hopefully) in the near future.