Reducing the threat to airliners
In the latest issue of the Federation of American Scientists' Public Interest Report, (not on the web yet, but soon available here) Robert Sherman argues that attacks on airliners using shoulder-launched missiles could be used by terrorists to devastate world air transport.
Sherman argues for "controllable enabling" (roughly the technology that makes your car stero not worth stealing) to reduce the damage from stolen weapons. He also tells a sad and entirely credible organizational-behavior story about why that wasn't done years ago.