"On its official blog, Google notes that Google Apps Premier, Education and Government Edition administrators can implement a new sign-in process that requires users to use a combination of a password and a one-time verification code delivered through users’ mobile phones.
"This is how it works: When Google Apps users sign-in from a certain location, they have to enter in not only their user password, but also a code that is generated either by an SMS message, a voice call or from an app installed on their mobile phone."
I'm a multi-disciplinary designer-strategist at HP. My passion is whole product design: the seamless integration of HW+SW+Web to deliver compelling experiences to users. I'm currently swimming upstream to bring Web 2.0-style community participation to HP's consumer printing business.