I had the closest call yesterday at the WBP.
I went over the bars while riding Dirt Merchant, landed right on my head.
The helmet protection was outstanding. It was a 661 Bravo Carbon. Got badly shattered, but it absorbed the impact so well that I didn't even had a concussion.
The injuries: Minor compression fracture in one vertebrae, bruised ankle and bitten tongue :S.
I'm lucky that I'm still walking, and the doctor says that they don't foresee any major consequences.
Anyway, riding will be put on hold for a while, until I have some more checks done, and my stiff back and neck heal properly.
ride safe! :)