Here is a fun one on USB threat
BBC NEWS Technology Warnings over USB memory sticks: "Smart phones, iPods and USB memory sticks are posing a real risk for businesses, warn security experts. "
Companies like Safend do aim at mitigating that threat and I do see many environments where those areally are a major risk factor.
So, do you care about those evil USB sticks? Is the battle lost and users can always steal the content (even withou the analog hole)?