In reply to woodsy:
I have a prized photo of a rock 3 placed 'upside down' in a friable vertical parallel sized slot with about a mm of the nut itself still showing; it's basically being held in place by a slight camming action as the wire is bent over towards the crag top. This is clipped to the rope using a snaplink quickdraw with both gates resting on the rock. This is the only anchor used by someone at the top as they belay a couple of people up the route.
This, too, was at Windgather.