How did Apple make the custom map tile/overlay and controls for iCloud's Find My iPhone Web App.
It has a really nice grid on top of the map and the zoom controls etc are all custom.
Maybe I missed it in the docs but couldn't seem to find it.
For anybody's reference if they stumble across this question.
The answer is in the docs here - http://code.google.com/apis/maps/documentation/javascript/v2/overlays.html#CustomMapTiles