Two new services have been lauched that enable you to monitor drivers via GPS-enabled cell phones. Teen Arrive Alive and ULocate offer the service for under $20/month if you have telephone service through Nextel or Motorola respectively. These programs will provide the location and speed of the auto. The Teen Arrive Alive service transmits speeds and locations while the cell phone is in use. The ULocate service can transmit the data every two minutes.
Read more at Teen Arrive Alive