We've discussed 2-factor authentication in the past, but its always had just a few sites using it.
That's changing, here's a site with a large list of services/providers: http://twofactorauth.org/ and here's a more general Life Hacker post: http://goo.gl/QyRdW7 Its hard to say how successful these will be. Google's authenticator app is being used by multiple services which reduces the number of apps you need. I'm not sure if the idea of "knows machines" is a large risk: the 2 factor PIN is not needed beyond the first login on a particular machine. But its a step in the right direction. -- Owen
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