Crash test from Mercedes’ new SLS AMG 2010 car shows new technologies to avoid serious injuries to drivers during a crash:

I’m not shure about the first part… seems the car is more “crashable” on the front part but has a security bar that prevents the damages from getting to the driver’s seat.
But the second part is really interesting. If an accident happens where the car ends upside down, there’s a system that will automatically set the doors loose. A great feature given that quite often, when accidents like that happens, the passengers ends up trapped inside the car because the doors locks them in.

Source: TechEBlog