<< WTF !?!?! The crash on the last lap wasn't even that bad. >>
As already noted, the driver in this case experienced/absorbed the brunt of the energy caused by the collision with the wall. No doubt "E" was killed in a similar fashion to what happened to both Adam Petty and Kenny Irwin last year. It is time for NASCAR to get off its high horse and mandate the HANS device. While it cannot be proved 100% that it would have saved "E" in this case, I'd say it would have given him a much better chance of surviving. With such sudden and brutal deceleration, the neck of the driver is essentially snapped. This is what the HANS is designed to prevent. CART has mandated it for ovals, and F1 is adopting it as well. Even several NASCAR drivers wore the HANS today, for example Dale Jarrett.
Like others, though I am a diehard racing fan (F1, CART) and not really a major NASCAR fan, the Daytona 500 had special significance to me. I was likely conceived during Daytona SpeedWeek of 1957, my dad was there as a fabricator for his friend, a local (Ohio) driver named Johnny Wolford, and mom had come along with him. And "E" was my favorite, not only because of his skill and legend, but also because of his personality, and also that he drove for my employer, so it was natural for me to root for him.
I've followed auto racing for as long as I can remember, probably 35+ years, and I've seen a lot of tragedies. This one hurts a lot, it ranks right there with when one of my other driving heroes died, that being the great Ayrton Senna.
My thoughts and prayers are with the Earnhardts ...