http://www.nytimes.com/2006/02/02/fashion/thursdaystyles/02tags.html?_r=1&oref=slogin
"The physical reality of the chip in the body is no big deal," said Amal Graafstra, who in March 2005 became the first known person to independently have himself implanted with a chip by having a surgeon friend place it in his hand. "But the symbolism of the tag is much more of a big deal as a social marker."
While I do not look at this as "the mark of the beast" or anything like that, I still would never get this done.
These things work by receiving RF energy and then they transmit back out RF energy no batteries or other power source is needed.
If you have an 802.11 wireless AP in your home, they DO put out enough to energize these RFID chips. This could (not likely) give a thief an inventory of your home. Depending on how much of your stuff has RFID.
What if you have your bank account or credit card information on one, implanted into your hand. It seems to me that would be easier to steal than someones wallet.
I am interested in hearing what others think of this new technology.
(Side Note: If you expose these things to a high level of RF radiation, they will get hot, smoke, and sometimes catch on fire. LOL)