Here is another great video from DeepSec2007. This one is a talk about the Economics of Information Security. From the summary:

The economics of information security has recently become a thriving and fastmoving discipline. As distributed systems are assembled from ... all » machines belonging to principals with divergent interests, we find that incentives are becoming as important as technical design in achieving dependability. The new field provides valuable insights not just into 'security' topics (such as bugs, spam, phishing, and law enforcement strategy) but into more general areas such as the design of peer-to-peer systems, the optimal balance of effort by programmers and testers, why privacy gets eroded, and the politics of digital rights management.