USB is a godsend, but
We should take a lesson from people who deal with drug users: harm reduction not behavior elimination.
Most people will be exposed to malware on a stick, but unlikely to be exposed to chip-level attacks. And they are never, ever going to stop plugging things they find into their computer.
So, what actions does a user need to take -- a real user, not a Reg reader, mind-- to protect themselves from nasties on the stick when they plug it in? This kind of stuff is too much.