Revisiting this thread (sorry), I'd like to try this again with a different camera. My wife's Christmas present was a fancy new Canon S100 (it's freaking awesome for a point and shoot), and so I'd like to do something with her nearly 5 year old SD1000. It has the little flap on the bottom that you'd use for an AC adapter, so now I could use something like this to power the camera. However, I'd like to be able to power it for a long time without an outlet available. Does anyone know of a battery I could use for this kind of purpose? I'm looking for a pre-built solution, as I don't have the know-how to wire this kind of thing myself and make it look prettier.

*edit*
I think an ideal solution would be if I could find something like this, but with the right plug for the little phony battery you put inside the camera. Then I'd have a way to connect the camera to an AC outlet when I wanted, and have a little portable battery pack when I needed it placed somewhere where that isn't possible.

Heck, that would be kind of nice for just carrying around. Those tiny little Canon batteries have pretty bad capacities...