I'd have to disagree with the post title. I think logins are reborn, and it's mobile that's resurrecting them. I'm working on a project to build a pervasive authentication system (http://www.toopher.com) that finally allows for systems to protect their user's accounts with more than just a password but without annoying the heck out of them. Instead, why not use the location awareness and network connectivity of smartphones to learn where you should be when you log in from a given device and automatically provide additional protection. I'd love feedback from the collective HN braintrust, here's how it works: When a request is made, a website can push the details to your phone, where they're displayed and you can grant or deny them. But instead of bugging you every time a request is made, you can opt to remember your decision and automatically respond to identical requests when you're in the same geographic location. This way we only pester the user when something is out of the ordinary (e.g.: they're in a different location, using a different computer, etc.), and fade into the background for the majority of requests.

Since it streamlines authentication, there's no reason to limit it to just log ins. Sites can authenticate any action they decide is critical enough to warrant it (e.g.: a bank could authenticate requests to transfer money, etc.). There's also potential for other scenarios like credit card transactions, physical security, etc.

Anywho - I'd love to get feedback. Any thoughts?