I've done a number of Da Vinci Code events recently, some of which I recorded. The audio files are now available online for a limited period (as new material becomes available, older material will be kicked out).
The first is from an event in London which includes some material on Leonardo and on the supposedly factual Priory of Sion. Dan Brown claims that its history goes back to 1099, but in reality it only goes as far back as 1956 when it was started by a convicted fraudster Pierre Plantard.
The second is from an event in Whiteparish, Wiltshire, and includes material on spirituality in The Da Vinci Code - in particular the quest for the sacred feminine and goddess spirituality. You can read my article on this on CultureWatch.