This is a small module that helps you annoutate Google Maps through a pythonic interface. Use it to generated a KML file which can then be fed to http://maps.google.com for display.
from pygmap import GMap
m = GMap()
m.add_placemark(lon="-122.0827778",
lat="37.3861111",
title="Mountain View, CA",
desc="this is a <b>placemark</b> over Moutain View, CA. This field can contain HTML formatting!")
print m.renderKML()