Segways have had a tough time in big cities, mostly because the city planners can't seem to decide whether they should be ridden on the street or the sidewalk. Here in New York City they remain banned, as their wide stance would be a nightmare on our jammed sidewalks.
The Orbis Urban Mobility Vehicle might be one answer. Looking kind of like a one wheeled Segway, the Orbis' handle can be folded around the wheel, making it somewhat portable. This means that you can hide away your geeky transportation device once you get to work. Unfortunately, you'll still look like a total dork when riding it.