Texas Instruments comes on along with chief legal counsel for American Express, Visa, Discover, and everybody else... They were way, way outgunned and they absolutely made it really clear to Discovery that they were not going to air this episode talking about how hackable this stuff was, and Discovery backed way down being a large corporation that depends upon the revenue of the advertisers. Now it's on Discovery's radar and they won't let us go near it.
In related news, here's a post showing how to steal RFID credit card information with $8 worth of equipment from eBay.
update: mythbusters co-host backpedals on rfid kerfuffle
from cnet: MythBusters co-host Adam Savage is stepping back from public comments suggesting that legal counsel from several credit card companies led the Discovery Channel to pull the plug on an episode dedicated to security holes in RFID.