I experienced my first alert of a pedestrian a few weeks ago (on Thanksgiving, actually). Unfortunately, it was a false alarm. I was on a two-lane road, coming around a curve to the left. There was a sign post on the right side of the road, which vaguely resembled a human form (diamond shaped at the top with a rectangle below it - it could have looked like a head and shoulders).
As I rounded the corner, I heard "beep beep beep" and saw an red image of a human on the right side of the IC. No automatic braking. I hit the brakes pretty quickly so I am not sure if I had waited if automatic braking would have occurred.
Pretty cool though - I haven't heard of anyone else seeing the red human form except for a contrived test with a willing subject.