PlaceEarth is a demo of how you can use Yahoo Placemaker to find geographical locations in a certain web site and show them in Google Earth.

Simply enter the URL of the site you want to analyse in the following form.

API (of sorts)

If you want to see the outcome directly in Google Earth as KML, simply add an output=kml to the URL. For example:
index.php?url=http%3A%2F%2Fwait-till-i.com&output=kml

To debug and see why nothing was found add raw=true to the URL. For example:
index.php?url=http%3A%2F%2Fwait-till-i.com&raw=true