A brand-new video showing a small airplane crash from inside the aircraft:

http://www.youtube.com/watch?v=yDu0jYiz-v8

The video claims that a combination of density altitude and an "air pocket"
brought the aircraft down into the trees, but all I see are effects of density
altitude and what looks like the beginning of a stall.

Everyone survived. The passengers walked away from the totaled aircraft, the
pilot was badly injured but will recover fully, and the cameras were
completely unaffected.

It's interesting that the FAA produced a corny but informative video on
density altitude half a century ago, and it's still pertinent today:

http://www.youtube.com/watch?v=RZCb6nw_T4U

It almost looks as if the movie were made in the same area as the crash.