Tech//404, a new venture by insurance company Darwin, sells insurance for losses due to technology and security failures. And they now publish a “Data Loss Archive”, a sort of repository of horrible acts of corporate data theft (it has potential, but should it only has a number of recent events and really should have an RSS feed).
They also have a “Data Loss Calculator”, a rather grim calculator that lays out the cost of data breaches — but it has zippy sounds (insurance company folks are such wild and crazy people.)
The real costs of data breaches — ruined credit, stolen identify, etc. — are far harder to calculate.