VISTA: Don't overindulge
Despite vital new features, experts caution agencies to go slowly when
   rolling out Microsoft's new OS 
From: Govenrment Computer News - 10/23/2006 - page 28
By: Joab Jackson

508 compliance 

Any Vista rollout should include provisions for 508 accessibility compliance.
Vista has an updated set of features that offers disabled users better access
to their data, such as improved contrast and magnification, said Ed Leary,
Windows and accessibility specialist for Microsoft Federal. When the OS
starts up, users get the option of launching accessibility features
immediately rather than turning them on later.  

Perhaps the most notable new accessibility feature is integrated voice
recognition. This allows users to start and operate their computers using
only voice, instead of typing in commands and text (previous Windows versions
supported voice input, but it was not integrated into the base OS). Such a
feature could be a real bonus to those with carpal tunnel syndrome, or users
who simply aren't good typists.  

Voice recognition requires something else IT managers must factor into their
Vista migration plans: training. It takes about an hour to teach Vista to
recognize a user's voice, according to Leary. It also takes time for the user
to get used to voice commands. 

Extracted from:
http://www.gcn.com/print/25_31/42322-1.html