Update: 9/27/11 OnStar has decided not to sell past users data after the bad publicity they have received.
Original Story: Government Motors was trying to be secretive about this, but the memo leaked out, plus the car is kind of a dead give away.
Seriously though, GM OnStar’s terms and conditions have changed, and now stipulate the company has the right to collect and sell personal information on your vehicle, including speed, location, seat belt usage and other information. Read Here: iSpy Government Motors
They will sell this info to anyone for a price. They could, for instance, sell it to the police to determine how fast you are going. They can sell information on the owner too, what’s to stop them?