Bruce Schneier is the author of Applied Cryptography, the incredibly useful encylopedia of modern cryptographic algorithms. He also publishes the Cryptogram, an electronic
bulletin involving computer security, privacy and cryptography. Today I received the latest issue, which includes an article on fooling biometric fingerprint scanners. Tsutomu Matsumoto tried several techniques to create phony fingers that the fingerprint scanner would accept as real. Nifty!

Addendum: You can click here
for some slides that Matsumoto did detailing his work.