Google Maps API documentation:
- API Concepts http://www.google.com/apis/maps/documentation/index.html
- API Reference http://www.google.com/apis/maps/documentation/reference.html
KML Documentation: http://earth.google.com/kml/
API Keys:
- http://localhost => ABQIAAAA0cEohAAjS3vxiA1vSBovKRT2yXp_ZAY8_ufC3CFXhHIE1NvwkxQW4-h3Buh3X9iip7nWhtP5c8JF3g
- Googlepages: create an account and get a new key
Code samples: http://doug.ricket.com/geoweb/examples/
Test your Maps API code without the need of a web server: http://geoday2.nl.googlepages.com/run0.html