Economics of Information Security.
Alex has an interesting post pointing to a collection of links Ross Anderson has on Economics and Security.
I've read most of the information there before, and the real gem within that entire page is the link to a paper Ross wrote on Why Information Security is Hard – An Economic Perspective. It was one of the first papers dedicated to information security which really touched on the heart of the matter. If you haven't had a chance, you might consider reading it. It applies economic analysis to explain a number of phenomena that security researchers had previously found to be pervasive but perplexing.
Happy reading! [Dana Epp's ramblings at the Sanctuary]