Google Authenticator

You're really starting to run out of reasons to not use Google's two-step authentication. An update today to the Google Authenticator application adds the ability to turn on two-step authentication without having to scan a QR code or re-enter your password on the device. Quickier, easier, and more important than ever, folks.

If you've yet to turn on two-step authentication, you need to do so today. (And you'll also want this app.)