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One of the major things you can do to save battery life is to turn off the 3G when you don't need it. This almost eliminates the appeal of the iPhone 3G, but you can always activate it again if you want it. Other tips include turning off the auto-brightness, turning off location services, turning off Wi-Fi, turn off Bluetooth and limit your use of GPS.

- Turn on 3G only when you need it. Having 3G turned OFF save battery life. Using EDGE actually isn't that painful-just think of it as a mildly disfunctional WiFi hotspot!
- Turn off Location Services.
- Turn off Auto-Brightness. Manually move the slider to 25% or 33% brightness.
- Turn off WiFi until you need a hotspot. The iPhone's WiFi will automatically try connecting to SSIDs it detects.
- Turn off Push. Change your Fetch schedule to Manually.
- Set Auto-Lock to 1 minute.
- Turn off Bluetooth.
- Limit GPS use unless you really need it.
- Do a monthly battery calibration. According to the Apple website, you should be doing this periodically. Give your iPhone a full charge, then let the battery run out. Recharge.
- Usually with lithium-ion batteries this is not necessary as they maintain no "memory effect"...but it's worth a shot in this manner or charge your iPhone via usb attached to your computer, rather than to the wall socket