Zoom beyond native tile size by Google Maps API scaling
Implement unlimited zooming with existing rendered tiles - by resizing the tiles from the maximal available zoom by Google Maps API JavaScript on the client side.
It is possible to do this functionality by calling GGroundOverlay for tiles which are in the viewport.
Related links:
http://groups.google.com/group/Google-Maps-API/browse_thread/thread/b28081e9006eca3b/1a6fd39a9f2d369e?pli=1
Done in JavaScript in Google Maps V3. See http://tileserver.maptiler.com/. The viewer is automatically generated with new MapTiler.com.