Captchas have always been exclusive; firstly it took time to convince designers an alternative to the visual code was necessary and secondly when audio options were finally provided they were next to useless. If you haven’t tried an audio captcha then you should. They are typical of the tokenistic attitudes which underlie the majority of web design and development. I don’t know what’s worse – content provided in a single fixed format or an alternative version which doesn’t work.
The BBC has come up with the worst alternative yet. Try emailing an article (I tried with an article about pulling the plug on the NHS e-records system after 9 years of failures – I thought the synchronicity was apt!) To complete the email link process you need to use a captcha. When you select the listen option a QuickTime file opens and initially it sounds good; for once you can actually make out what is being said – but once you’ve listened you realise file has taken over the window with no way of return to the original page where the captcha was in the first place. Nice one BBC. Did you not think to try it out on anyone first?