Since Ubuntu is meant to be human friendly, I suggest adding the Accessibility settings from System>Preferences>Advanced Desktop Effects Settings (not installed by default) to System>Preferences>Assistive Technologies (or maybe elsewhere?). The rest i believe to be mostly eye candy, but these Accessibility settings can be crucial to ones productivity and should therefore be included by default.
Case1:
Elvis has problems concentrating with all the background windows or he gets confused which window is active, ADD Helper helps him find focus.
Case2:
Old John has bad eyesight, and even a 800x600 resolution seems soo small that it might just as well be 1600x1200, with the help of Enhanced Zoom Desktop he can easily enlarge on screen text to a size he can see without sodomizing the screen with his face.
I think the other accessibility options might be equally useful for some people, also the level to which they can be configured makes them flexible for people with different problems, so i also suggest that these tools be added in their current state without simplification (if it aint broke...).
