We have developed a voice biometric-enabled plugin / iPhone app combo to provide secure, multifactor login authentication for WordPress. It's all under the umbrella of VoxedIn (www.voxedin.com). The first outing of the tech is the WordPress plugin. Plugin is here http://wordpress.org/extend/plugins/voxedin/
We need your help to test and provide some input to improve it - it's in limited beta right now and we ask for your feedback on how it's working.
VoxedIn is a smartphone app and web toolkit that lets your users log into your site using their voice. It uses voice biometrics to verify that the person you allowed to register is the same person who is now requesting access to your site. It's simple, convenient and secure.