Looks like big brother has a little sister.
Today in the news blows the wind of change. OnStar is going to continue tracking you even if you quit their service and may/will/can make your information available to others. So those of you that have a concern Im including a link to disconnect it should you wish to.
The article on OnStar:
OnStar Tracks Your Car Even When You Cancel Service | Threat Level | Wired.com
The link provided is to disconnect if you wish:
How to Take OnStar Out of a Car | eHow.com