Just wanted to add that I had a friend jump from the 8th floor (or maybe 10th?) of an apartment complex, land on concrete, and not die instantly. It took him about 36 hours to die from cranial pressure.
So I think even if you jumped out of a plane and landed on concrete if you don't land directly on your head there is a chance you will take a long time to die.
And if you jump off a building or a bridge or something and land on concrete I think the chances are pretty high that you won't die instantly, you're going to be in agony with your whole body broken and crushed for at least a few minutes if not hours or days.
So based on that jumping is a no-go for me, unless like I said in a another thread, you're jumping into a volcano. That's just awesome.