Why not log into web sites via email without any password?
jasonlbaptiste: we sort of did this with Ramamia.  ACtually in the first version, there were NO passwords.  You would create a family, then register your email to it.  From that point on, the cookie kept you logged in or you clicked the email login link.  People liked it, but enough also wanted passwords that we added them soon thereafter.  The real takeaways were:*  Give before getting - we let you use the service before we ask for your email.
*  Make logging in via email simple. ie- Someone in your family posts a photo, you click on the link and you're logged in.
*  Don't get rid of norms (having passwords), but its okay to have new ways to get around it.