"A CAPTCHA is a program that can tell whether its user is a human or a computer. You've probably seen them — colorful images with distorted text at the bottom of Web registration forms. CAPTCHAs are used by many websites to prevent abuse from "bots," or automated programs usually written to generate spam. No computer program can read distorted text as well as humans can, so bots cannot navigate sites protected by CAPTCHAs."
I have been using LastPass for a while now and I was very happy to find out they now also offer two-factor authentication. This has, as far as I know, been available since ages but you had to use a Yubikey. I don't know when they added support for Google Authenticator but they did. And since I have been using this for a while for my GMail and Google Apps accounts I was glad to find out Lastpass supports it too.