Luis: With guidance from people who were obviously smart about this stuff, we were pretty cautious in our own billing of GNOME 2.4’s accessibility:

Support for people with disabilities has been a key goal and focus of the GNOME 2 desktop platform, and successive releases have included increasing support for accessibility. With 2.4, users will be able to evaluate GNOME with assistive technolgies.

I think that honesty is the right thing, and that people who promise otherwise and can’t deliver will be bitten.