On Captchas, and a nifty slide for those who can read Braille visually

There's a slide show called Accessibility Problems with Visual Verification Systems talking about visual verification systems such as captchas (those images of distorted text that are supposed to prove you're human) and problems with them.

Many slides have images of typical captchas (e.g. those provided by LiveJournal, PayPal, Passport, ...); one particular slide had a "type the text of this image into this box" which probably not many people could comply with :) (to illustrate the point, I suppose).

I'll tag fledchen, leora, and pthalogreen as probably being able to.

(no subject)

I wish ISO standards weren't so expensive.