Interesting new security technology acquired by Google
The company is SlickLogin and the idea is to use high frequency sounds generated by web sites that will work with users' smart phones, either as a password replacement or to supplement traditional methods to provide two factor authentication. Read more about it here:
http://news.cnet.com/8301-1009_3-57618984-83/google-acquires-password-sounds-startup-slicklogin/