inXout monitor for Mac

From Underwriters Technologies:

inXout monitor is a an application that monitors the health of a Macintosh computer running OS X 10.3 or greater. (Tiger too!) It runs as a headless application on the mac being monitored and sends regular status reports (called telemetry packages) to a master server on the Internet. The master server reads the data and analyses it. If any one of a number of potential problems -- such as the hard drive becoming full, network connectivity being interrupted, etc. -- occurs, the master sever will notify you by email that there is a potential problem. The inXout website allows you to see a full history of the telemetry data. If you want to see when an application quit or was restarted, it is simply a matter of logging into your inXout monitor ac- count on the web and viewing the log files online, or dumping them into a .csv file for leisurely review.

Potential Uses

Macintosh administrators in enterprise, schools or laboratories can monitor the status of many macs and spot problems before they get out of hand

Corporate IT or Help Desk support.
Monitoring the health of a server or its applications
Making sure a Kiosk is up and running properly.
Keeping track of your mother's, father's, girlfriend's, boyfriend's or child's mac.