Automatic Crash Response: There's an accelerometer built into the mirror that detects the sudden shock of an impact from the front, side or rear of the vehicle — and automatically calls an OnStar advisor.
Emergency Services: Pressing OnStar's red emergency button links customers to a specially trained emergency advisor for assistance in situations occurring inside or outside of their vehicle.
Stolen Vehicle Location Assistance: OnStar will tell law enforcement where it is if you report it as being stolen.
Turn-by-Turn Navigation: Downloadable spoken turn-by-turn directions for reaching customers destinations.
[Source: Jalopnik]
