lilnyc,
I'll second that. The CitiBikes' racks are really big (dozens of bikes wide) and when I see them I think "why don't we have the same thing for Segways?" The racks even have charging built into them, presumably for charging the blinking headlights/taillights.
With thousands of people riding bikes in Manhattan's "lanes are just recommendations" traffic, sans helmets, Segways seem like a no-brainer alternative.
I do see people riding Segway PTs every once in a while in the city, but it makes me sad to leave mine at home
Chris