KML in Google Maps: one-on-one with the Google Maps Team
It appears that the URL for these KML-driven maps follow this format:
(concatenate the above two lines as a single long string with no spaces)
Replace www.yourdomain.com/yourfile.kml with the domain and kml you are using. Additional customizations can be created if you follow the pattern in links for satellite imagery and hybrid modes. Their API documentation undoubtedly provides either direct or indirect additional details.