i think this could be the holy grail of authentication - when amazon starts using *real* authentication, you know someone has done it "the right way". (ie. someone has come up with (and deployed) a way to authenticate that is so simple that *any* consumer can figure it out and not think twice about it.)
what will that look like? a thumb scanner connected via usb? some personal unique universal pass phrase? a usb disk w/ a cc # and a private key? i dont if any of these even come close to really being better than plain old credit cards - but like michael H said, when you factor in phsyical security (and social engineering) things get impossibly difficult to secure.
http://whatis.techtarget.com/definition/0,289893,sid9_gci214194,00.html
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