The internet has become ever more risky, and passwords ever more insecure. Verisign provides a solution called two-factor authentication, which allows users to sign into important accounts using one-time passwords generated from an app on their phone.
The service is now being extended to Windows Phone 7 also and supports leading websites like PayPal and eBay.
It does not look like the app has hit Marketplace yet, but I expect it will not be too long before the security conscious have one more option to protect themselves.
Read more about VIP Access at Verisign here.