Originally Posted by
Drek82
I have and use the Just Mobile Gum Pro 4400mAh and it works great. I have a iphone 3gs and my wife has a iphone 3g and it charges both of them. It has ~3-3.5 full charges on it. The biggest reason I picked this one was mostly because I could use it to charge any USB device that I have ... so it has come in pretty handy for things like my bluetooth or kindle when I forgot to charge those before leaving for a trip.
Drek
I'll second that.
I use the same thing for my ipod video so I can watch movies on long flights. So far I think it is well worth the money. I just got an iphone 4 and it also work with that phone.