My vote goes to the "MicroSpikes" and I'm seriously thinking of getting some for this winter.

Backpacking last week on Colorado's Arapaho trail on patches of slippery snow, stomped down by many boots, I wished for the pair of MicroSpikes I had seen at a mountaineering store in Boulder the day before. And the next morning on the way out that packed snow had frozen solid, making it even more slippery and making me REALLY wish I had those short spikes.