Eye-Fi SD Card

The Eye-Fi SD card looks and feels like a regular SD card but within, it's got an 802.11b WiFi interface. It can send images or videos from a camera to a PC or an online hosting service, thus eliminating the need to carry along your notebook PC, USB cables and other dongles.

On the inside of an Eye-Fi card is Samsung Flash chip and an Atheros WiFi chip. You can see a pretty details snapshot of it on IkonTools:
http://www.ikontools.com/articles/eyefi-dissected



In a recent incident, a stolen camera had a picture of the felon sent via WiFi along with other vacation pictures. You can read more about the incident here:
http://blog.wired.com/gadgets/2008/06/smile-youre-on.html