This is a really fantastic idea - boots with a set of reversible cleats on the foot and heel that can prevent slips on snow and ice. When you are heading indoors, just flip it over to hide the steel studs.
The whole mechanism is set flush into a groove on the sole, so it should be as comfortable to walk in as a standard boot. Plus, they are made from waterproofed leather for added protection. The boots aren't cheap at $US200, but it's better than breaking your arse in the driveway. [Hammacher via Crunchgear]