Get the Zap! Portable energy charger!
I had one for my iPod, but it's not compatible.
The Zap! portable energy charger (for ipods) is a quality product and fits nicely with the iPhone.
I have a bit of velcro on the back of my phone (I know, I know - you purists, you-) so I can hang it in the car, on my belt, etc. and that extra thickness seats it perfectly into the Zap!
The Zap! is an extra battery, dock, charger for the phone. When hooked up via USB (I'm windoz) it functions exactly like the Apple dock and charger (oops - not exactly - there is no audio out port). It's all slick black and matches the phone. I just got it today and I'm impressed.
www.portergy.com is the site listed on the back of the device. Model #RO*-IV.
Pick one up.
