Tracker generates Google Earth KML files from GPS equipped Windows Mobile devices. You can also use the KML files in Google Maps.
1.30 adds a few commonly requested options to Tracker.
Sample Interval - you can now configure how frequently Tracker records a position sample, from once a second to as long as you like. The default is twenty seconds.
GPS Power - if you're recording samples infrequently you can choose to power down the GPS between readings. The default is to keep the GPS powered up and in most cases this means that location samples will be more accurate.
Store elevation in KML - it's now possible to log your altitude above sea level to the KML file. The default is to not record elevation. Google Earth will automatically fit the KML track to it's internal elevation and in most cases this is what you want. If you're a pilot recording a flight then set this option to show the GPS altitude rather than fitting the track to Google Earth's data.
Download Tracker 1.30 from the original Tracker post, or on your Windows Mobile device from http://www.catfood.net/m/.