One of the interesting minor details on the iPod nanos released today is the inclusion of some new accessibility features. There's even an Accessibility section on the spec page, which notes the addition of spoken menus and an alternative larger font. The spoken menus "allow listeners to hear many of the names of menus, song titles, and artists without viewing the screen."
While this is clearly a boon to those with some visual disabilities I suspect it could also be handy to other folks as well, since it will presumably allow changing song, playlists, etc. without looking at the screen, which would be really nice while driving. According to Infinite Loop a nano with this feature turned on will even inherit your Mac's VoiceOver voice. Unfortunately, it's not clear if other iPods or the iPhone will also gain this feature at some point.