I came across the Mechanical Turk/Google Earth effort this morning, and called my young children to come and take a look. We talked about some basic SAR issues, and then sifted through 100 quadrants together, talking about what we were seeing. Two of them had some slightly unusual reflectance features, and so we duly tagged them so someone more expert could take a glance. It would be fascinating to have a sense as to how many people did something similar, and to know how many quadrants were examined collectively.