2-factor verification now comes to Apple & iTunes:
http://support.apple.com/kb/HT5570
I've been using 2-factor for Google and its worked well so far.
More of the more sophisticated sites are using this now. Downside is that they don't use a common authenticator app, the depend on sending you SMSs. Doesn't work well in europe etc because I change to local phone numbers there.
Google has a pin generator app for the phone that works fine in europe, and they also give you 10 one-time passwords for when you are not connected.
-- Owen
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