This is pretty neat! EchoLink, the voice over IP software for Amateur Radio, now provides a Google Earth KMZ file showing the locations of all the currently connected nodes. As well as that, if you click on a link it shows the frequency. So, if your travelling somewhere you can visually see the links along your route and note them down. Very useful! The file can be found here:
http://www.echolink.org/node_location.kmz
