Ben Jackson has posted an excellent article on the MBTA's latest bit of stupidity on his blog at innismir.net- check it out at: Anatomy of a Subway Hack - Banned in Boston!
If you hadn't heard, the MBTA (Massachusetts Bay Transportation Authority), the folks who run public transit in and around Boston got a temporary restraining order against three MIT students who were going to present their findings about vulnerabilities in the MBTA's "Charlie Card" fare system at DefCon16. So if researchers don't talk about a problem, it doesn't exist? That's like a two year old playing hide and seek; cover your eyes and you're gone (I apologize to any two year olds I may have offended by comparing them to the MBTA).
Read the EFF's (Electronic Frontier Foundation) response here: http://www.eff.org/press/archives/2008/08/09