I made the move over to the Google Maps API for mapping and geocoding. So far I have had some mixed results, several users have commented that the geocoding is not as good as before with Yahoo.
However Google Maps provides a few nice features like returning accuracy and postal code, some features we lost long ago with the Yahoo Maps JSON geocoder.
Also the Google Maps interface looks cleaner and gives us a few more hooks for doing nifty things with the map. I took the opportunity to clean up the main interface and try to make things easier for first time users.
Please post your comments and findings here. If you are having issues geocoding please include a few sample addresses.