I recently purchased a 4 Port Car charger on Amazon.

It always you to charge 4 phones at the same time. Because it is USB you could actually use it for any other device that charges through USB.

I got it for $10.99 which is a steal compared to $30 in the AT&T store.

Works well and glad to get it.

Check it out: [ame=http://www.amazon.com/RND-Power-Solutions-Charger-iPhone/dp/B004A76XFK/ref=sr_1_18?ie=UTF8&qid=1290312186&sr=8-18]Amazon.com: RND Power Solutions' 4 Port USB Car Charger for Apple (iPod, iPhone. iPhone 3, iPhone 3GS, iPhone 4, iTouch) and other USB powered devices: Electronics[/ame]