I found those linked elsewhere.
I really know little about them- but they look feasible enough to me. As I understand it, the key to walking in ridiculously tall and thin stiletto heels is to walk on the balls of your feet and not put any weight on the heels themselves. These shoes just take it to the next logical step.

Also, if you draw a line from the center point of the model's leg straight down, it passes through the flat part of the sole where it meets the ground. They're stable enough.
( The Resident Loon Not a demographic. Do not measure., Mon 13 Apr 2009, 20:33, Reply)