In a business where I was last employed, I was hired for a webpage application project
www.infotocka.si.
The project was interesting from the perspective that the main focus in it was a google map.
I used the v3 google maps, "kml layer" support for fast display of large amounts of points and info box "layer" instead of the standard "info window".
I could position the info box on the map, according to independent coordinates of the point.