Might be of help to some of you.
http://www.amazon.com/Amazon-Replace...6558794&sr=1-1
Someone posted the output specs for the charger as 4.9V 0.85A. Does seem kind of weird that a generic AC-USB charger doesn't work, as they have a 5V output like a standard USB port on a computer which will charge the Kindle.
Sorry Non-US residents, they don't ship that product internationally.