Date of release: Circa 1995
What it was: Passport was the first attempt at a single-sign-on (and virtual wallet) feature for the Web. Passport was supposed to let you sign up for Websites without having to enter all of your information each time. Passport could also store your billing address and credit card information.
Why it failed: The service basically freaked people out. Privacy watchdogs derided it, and many people criticized it for its poor technical infrastructure and security problems.
Fate: Passport is now rebranded as Windows Live ID, but is no longer a single sign-on for the Web. It is, however, an OpenID provider.
Successors: Facebook, Google, OpenID, Twitter, Amazon