Newsweek reported on the HOPE (Hackers On Planet Earth) conference in New York in 2006 where lock enthusiasts and experts demonstrated and lectured about vulnerabilities, even in high security locks. Marc Tobias, Barry Wels, Bruce Schneier, Clyde Roberson (Medeco Locks), were all quoted.
Security issues with lock bumping, especially postal service locks, was discussed in detail. Read the article in Newsweek.