There has been a hell of a lot done in Vista to improve the accessibility side of things, but unless you require some of these improvements, how do you know they are there, and what they do? Do your customers require these kind of features? Would it not be of benefit to you to be able to tell your customers about them?
Well, there is a Microsoft website dedicated completely to accessibility, not only in Vista, but in many other Microsoft technologies, such as the Servers, Internet Explorer and Office. You can find that site here.
Within Windows Vista, as with many aspects of the operating system, all of the accessibility related features are in the Ease of Access Center. Makes sense, right? There is some stuff in there that even I didn't know! :-)
It's interesting to note that the first time I opened up the Ease of Access Center, it presented me with these options...
...and explained exactly what was on the screen, telling me where I was, what options I had etc. It may not be much to you and I, but to people who find it difficult to use the computer due to a wide range of physical challenges, these kind of features, and the way they are presented, really can make a difference.
The key link in the Ease of Access Center is this one:
Clicking this link opens up a wizard driven dialog box which asks questions around Eyesight, Dexterity, Hearing, Speech and Reasoning and will automatically configure your computer based on your settings. These ease of use would be invaluable for a user who normally struggles with using the computer.
So, if you'd like to drill into accessibility a little further, I'd recommend having a look at the "Accessibility in Microsoft Products" site, and the Windows Vista Accessibility site in particular.