Comment Text messages as CAPTCHAs (Score 1) 167
Bank of America, and probably others, use something they call SafePass as the equivalent of a CAPTCHA: they send a text message to your cell phone which you have to type back into a web page.
In the end, how strong a CAPTCHA system you use comes down to who feels the pain. A few spam emails sent by our system? Small price to pay to sign up new users for our [email|blog|whatever] service. An unauthorized transfer of $any_amount that we'll have to cover? Clamp down hard.
