The XTool Computer Tracker. Software based transmitter for tracking and recovering stolen computers. Sounds like a steal. [Update: Check out the comment from Christian for an interesting free alternative.]
When a computer is connected to the Internet or to a phone line the XTool Computer Tracker sends a signal to our monitoring network. The signal received contains all the required information needed to pinpoint the location of the computer. XTool Computer Tracker counts on its worldwide Internet monitoring coverage and unique dial-up monitoring coverage in Australia, Brazil, Canada, Colombia, UK and USA. The location of your computer is captured whether your business takes you from state to state or country to country.