Gah! People seriously don't rezaile how inaccessible those CAPTCHA things really are heck, I'm sighted, and I sometimes have trouble reading the things because of characters that aren't completely clear, poor contrast, and so on. The worst one by far that I've ever seen was case-sensitive (i.e., upper and lowercase matter), but included letters like X and O whose case isn't distinguishable without context.And the audio alternatives are getting less and less intelligible, because they have to add so much background noise much of which also sounds like it could be numbers! I like what ReCAPTCHA has done; instead of using random digits mixed with even more random noise, they now have you transcribe a sample of undistorted real-world speech.