My searching skills have become very bad. I didn't find any of the projects named here before Your's, robbie, seems to be very similar. I also implemented tracks (either all points in the db or the last n ones) and it works good but if you enable the TimeStamps in the .kml real-time tracking doesn't work anymore (as Google Earth sets the timeline to the current view and won't display the new points by itself). If you are using TimeStamps (didn't check the source yet) did you find a solution to this?

EDIT: I just did a co on your svn. Seems you didn't make much with the kml yet, too. Just a line. So if you open the kml file it will display the whole track, right? This was one of my problems, I wanted the whole track but focus and zoom on the current position (just think you drive 130km on a motorway, then enter a city and someone wants to see where in the city you are, he sees the whole track and if he zooms in it will zoom back every 10 seconds to the whole track). The whole camera system in the .kml format is still a bit strange to me.