Another company has released a backup battery pack for the iPhone 3G, Case-Mate with the release of the iPhone 3G Fuel.
The iPhone 3G Fuel is a protective case and battery backup in one, it with provide an additional 250 hours of standby time, and up to a total of 9 additional hours of talk time.
It will also give you up to 7 additional hours of browsing, 8 hours of video playback and up to 24 additional hours of audio playback.
The Case-Mate iPhone 3G Fuel Battery Back is available for $79.99 from Case-Mate.
via Oh Gizmo