Google's oblique aerial view imagery has now been added by default to maps created with the Google Maps API. When 45° imagery is available a submenu option is added to the Maps API Satellite button. In three weeks time aerial view, where available, will automatically become the default satellite view, as it is in the main Google Maps website.
You can see the cities where 45° imagery is currently available on this map.
In addition to the new 45° imagery an Overview Map Control is being added to maps created with the Google Maps API v3. This Overview Map Control is the small interactive thumbnail map you can see on the bottom right of Google Maps.
The addition of the Overview Map Control is the latest in some nice subtle changes Google have added to the design of Google Maps created with the API. Recently Google also changed the Google logo in API maps to a white logo instead of the usual multi-coloured logo and the buttons have also been made a lot more attractive.
Via: Google Geo Developers Blog