Someone is probably working on this already but in the mobile world we live in, plenty of people carry more than one battery operated electronic device whether it be ipod-laptop or palm-cellphone or mp3 player - black berry.
The problem with such devices is battery life.
A solution would be to create "mini jumper cables"(connector w/cord) that could transfer battery power from one electronic device to the other. The "mini jumper cables" could even give a reading of how much power the weak battery device has after transfer and how much power the other battery device has left after transfer.
I got this idea while giving a friend a "jump" because his battery went dead.
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Do you mean being able to run one device off of the batteries of another, already operational device?
That would be easy enough to do for standard cylinder (AA, AAA, C, D size) batteries, but becomes extremely difficult when you get to custom-interfaced batteries such as laptops and cell phones.
For those, I'd suggest building a Power-Out socket into the device that would allow you to temporarily power similar devices through a special cable.
MikeMol is onto the right idea. There's a Taiwan company that makes something like this for cell phones. They sell it as a key chain! All you do is pop into the local drug store & pick up a 9 volt transistor radio battery, hook it up to your key chain and you're good for another hour of cell phone use.