One of the first things you will notice after a short day with new Iphone is how quickly it will burn through the battery.
Turn off the 3G unless you really need it, this will greatly extend the battery life. Also keep bluetooth off if not in use.
There are some 3rd party quick chargers starting @ $40 or just keep a buch of chargers around. I have 2 floating in the house plus usb's on computers and car chargers.