trillianjedi - 10:49 am on Mar 2, 2006 (gmt 0)

How do Screen Readers react to CAPTCHA?

They don't - the screen reader user is completely blocked at this point, unless you offer him/her an audio file alternative, which is the only option that I've ever seen.

In our quest to battle form abuse, are we implementing features that put up major roadblocks for those with disabilities?

Probably. But I think that's more lack of discussion about usability than anything else. The technology to achieve security and accessibility is certainly in existence. Certainly the W3C formally expressed their dislike:-

[w3.org...]

If you want to use Captcha but maintain accessibility, you need to have an audio file download available telling the hard of sight user what text to type in. If accessibility is important to your site, it shouldn't be too tricky to organise.

TJ