According to this article in TechCrunch, Google is planning on rolling out an optional two-factor authentication to it's Google Apps Premiere, Education, and Government edition customers and then to the rest of us in the coming months. Two-factor authentication requires not only a password but also a six digit verification code that you've created when turning the extended security feature on. Many large business already employ such measures, usually relying on hardware dongles to generate and display random temporary codes, Google's system won't require the additional hardware and will be particularly handy if you access the companies services (gmail, docs, etc.) from your mobile device.
TechCrunch also says "Google has built a ‘Google Authenticator’ application for Android, the iPhone, and Blackberry — fire up the application, and it will give you the six digit verification code that you enter back into your browser (the system can also send you a SMS message or give you the code via voice call)."
Makes sense that we would want such authentication now that we are moving more and more into the cloud, and accessing our account via multiple devices via hot spots and various other networks. I think I like it!