Not sure if this is quite the right place for this, but I thought some people might find this useful.
I know many people are making projects that are using the small size of the pi as a forefront to their project. I don't have a pi to test with, but I would think something like this would be a good fit for those that want small, and portable.
http://www.amazon.com/Duracell-Powerhou ... d_cp_cps_0
Simple USB charging system for phones, but I would think it'd be great for the pi. I can't personally test it, as I don't have my pi yet, and I don't really have the money at the moment (car payment and rent coming up XD) to spend on it, but thought I'd throw it out there for people.