It is unfortunate that the authors chose to ignore Apple's work in this space with their excellent VoiceOver (VO) accessible technology which gives full access to the OS and applications. Because it's built in to every OSX 10.4 and 10.5 machine a blind user can set up everything themselves without sighted assistance. This also makes it a screen reader with the largest installed base; more than Jaws or WindowEyes. In a classroom setting there is no longer the need for the "special" machine for the "special" student, enabling a more mainstream approach. The on-screen feedback also lets sighted and blind users collaborate more easily because the visual user can see what the blind user is doing via the keyboard. Got a USB braille device? Just plug it in without having to install drivers. Got a lot of VO preference settings? Save a profile to a thumb drive and then instantly activate those settings on another machine by just plugging it in.
As mentioned in the article, accessibility technologies such as screen readers are not cheap. Getting a Mac with VO can easily offset the supposed premium price of this hardware. Alex, the VO speech synth is really one of the nicest sounding ones out there with simulated breathing and clear annunciation. Anyone can give it a try by hitting Apple-F5 on a current OSX machine.
I guess OSX is not a major OS or VO is just rudimentary, or the writer is just wrong.
There was a nice rebuttal on Lioncourt.com
Apple's innovations are not constrained to the iPhone/iPod/MacBook/OS realms. Sure it has it's quirks and glitches, but to not even get a mention is a serious error of omission.
It is easier to write an incorrect program than understand a correct one.