phpGMapTrips is a php application which allows you to easily record your travel destinations and display them with Google maps. It simply stores the trip points in a xml flat file (no SQL database needed). Each point can be included in many trips. The application include an administration interface and allow to export your destination in KML format to be viewed in Google Earth.
http://googling.phpmagazine.net/upload/2006/03/phpGMapTrips-thumb.jpg