For those who think the Segway isn't small enough, Honda might just have your device.
It's called the U3-X and most people think it looks like a space-age unicycle. And it's actually fairly striking in its ability to move not just forward and backwards but sideways and diagonally, too.
Top speed is 3.7 mph, which for most people would be a power walking pace. The device moves in whatever direction its user leans towards.