Threats to RFID enabled credit cards have been around for a while. This video is from 2008 and talks about reading RFID cards "in the future" with a enhanced receiver/antenna.

Steal Credit Card Numbers Wireless using RFID - Hacked Gadgets – DIY Tech Blog

More info:

Wireless identity theft - Wikipedia, the free encyclopedia

Were any of you guys who have found unauthorized charges using an RFID enabled cards (the ones with a microchip embedded)?