[Johngibb]

I definitely find this topic interesting and have a hard time remembering all my passwords, but I'm not fan of this solution. Honestly, how isn't this just a worse implementation of OAuth? It seems equivalent to clicking a "login via gmail" button, except with more of a lag?

[Fishkins]

The main other difference I can see is that one button actually functions as "login via gmail, hotmail, yahoo mail, or any other countless email providers", and no work needs to happen on the email provider's end to make it work. Lots of people don't want to sign up for FB or Twitter, but basically everyone has an email account.