I forget how I came upon Mr. Schneier's blog, but I like it. He takes a serious look at secruity measures, from computer passwords to how the TSA screens baggage. I have found his blog a great source of information, and even got some game ideas from it.
Do your players think they know how to defeat the corporate security system? Really? Surprise the heck out of them when you introduce a biometric marker keyed to the CEO's palm print and linked to a pulse-sensor.
I've added him to my daily reading list.