Google Earth on the iphone is very cool and the use of the tilting to change the perspective is very cool. But sometimes the tilt can be a little much if you are walking, riding in a car, or doing anything else where you phone is tilting a lot and causing google earth to go all wiggy. You can adjust the settings to keep this from happening. Just hit the "i" icon in the lower right to bring up the settings. You can then turn "AutoTilt" off and google earth will behave a little more stably in environments where you are moving.