I'm praying that a USB ethernet adapter will work without extra power. I'll hate to be in a place without wifi but with ethernet when I get my N810.

If it does need extra power, how would I add it? I know of those battery hacks made to supply the right current, but how would it be plugged in to supply power? Are there cables that split the pins for power to a female plug--letting you plug in a power source via USB?