Some RFID papers
Here are a few papers on the privacy implications of RFID.
The basic idea behind RFID -- Radio Frequency IDentification -- is to embed
all sorts of products with little tags that transmit information about
the product (at least when "illuminated" by an RF reader).
This technology could allow, for example, shopping checkout without
removing anything from the cart.
The privacy problem occurs when users leave the store, with their tagged
items (clothing, electronics, etc) still active. Wearing such tagged
clothing into other stores might immediately reveal what you are wearing
and who originally bought it.
Eckfeldt's paper is a good starting point.
Garfinkel's (at bottom) is maybe even better.
Late entry: Simson Garfinkel,
Adopting Fair Information Practices to Low Cost RFID Systems,
2002. A very good starting point for the papers above!