The Real - Time Captcha approach would go beyond what's required on websites by prompting a response that will produce live video and audio that would then be matched against a user's stored security profile. (sciencedaily.com)
Funny, considering a good chunk of the 200 IT staff in my building, myself included, are using Droids or now Droid Incredible's with full Exchange support, including security profiles, global list lookup and remote wipe. (bgr.com)