I'm tired of retyping captchas all the time, even on this blog. Yet captcha is the only way to protect against spam on discussion forums and blogs. There are several ways to implement it, and I've decided to use something new. Well perhaps it's not new, but I didn't notice it yet anywhere so I'm going to assume it's my own invention unless you prove me wrong ;-)
Instead of retyping graphical image, lets make there few checkboxes and let the user check only some of them, randomly. This way captcha can be solved by few mouse clicks, which is much less error prone than retyping strange textual font from classic captcha image.