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Google's doing it too: http://code.google.com/p/google-authenticator/

Howto: http://www.mnxsolutions.com/security/two-factor-ssh-with-goo...

EDIT: per my post in a sibling thread, Dug Song points out in the comments at the Howto that Google Authenticator can't be used as a second factor alongside SSH public key authentication.

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I haven't looked very hard at the Google stuff (thanks for pointing it out because now it's on my radar) but if it's open source I'm hoping it's designed in such a way that one could make a login_google that works similarly to login_duo, which looks to me from the blog post to require authentication and then exec your login shell upon success.

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