Watching David Purley trying to save Roger Williamson at Zandvoort in '73 is probably the greatest piece on there. Its a good example of heroism at its best, and the other drivers at their worst as they just kept driving by without stopping to help.
I remember a CART accident at Australia last year or year before, in the rain, when 5 cars were involved in a pile-up and one of them was flipped upside down, trapping the driver. Jimmy Vasser and another driver got out of their damaged vehicles and quickly went to the aid of the driver pinned under his car. They were the first on the scene, and it took several seconds before the track emergency teams were on the scene.
I remember this season, Dale Jarrett refusing to accept a ride from an ambulance, out of protest for the poor actions on the part of the rescue teams when he crashed the #88 Ford Taurus. He wasn't hurt, but it took an eternity before any track officials arrived.
I also remember Michael Waltrip getting pinned against the wall on the driver's side when he spun. He wasn't hurt but the car was undrivable. Since the car was wedged against the wall on the driver's side, he was trapped, unable to escape. Fortunately, his car didn't burst into flames. This year his car has an escape hatch in the roof. Why didn't they think of that sooner?