Great post. It's clear that CAPTCHA is not a cure-all, and needs to be combined with content filtering and IP banning and other techniques. But (as we say in t

Great post. It's clear that CAPTCHA is not a cure-all, and needs to be combined with content filtering and IP banning and other techniques. But (as we say in the show) the idea is to make spam uneconomical with a minimum disturbance to the user. Some users (e.g. handicapped, impatient) are obviously more disturbed by it than others.