Last week I received a sample of the mophie juice pack air™, which is a rechargeable external battery and a fully protective case in one for the iPhone 3G & 3GS. I love it!!!!! It's an absolutely ingenious idea. If your phone battery dies, simply switch the slider on the mophie and it charges your iPhone right back up. And, when it's time to recharge both, there's no need to remove the mophie juice pack air™ - simply use the included USB cable and plug it right into the wall adapter that you are probably already using from Apple. The color choices are great and there's even white, which makes it a great gift for the bride. And, for those of you that are getting the new iPhone this week, don't worry, mophie is already getting ready to launch a new compatible version for the new style iPhone.
PS: While I was gifted mophie juice pack air™, I was not in any way paid
to make an endorsement, I simply wrote how I feel about the product.