Stefan Geens, whose blog Ogle Earth is full of cool and inspiring Google Earth tricks, has a great tip for using Google Earth for iPhone. To maneuver between views quickly, you can save Google Earth imagery by taking iPhone screenshots.
To do this, make sure the Google Earth view you wish to save is visible on your iPhone screen. Press your phone's on/off button while holding down the home button -- the screen will briefly flash, and an image of your screen will be saved and placed in your camera roll.
This trick allows you to flick between different Google Earth views in your camera roll without having to start-up Google Earth on your phone, or wait for different imagery to load.