WikiLeaks and other whistleblowers form an important part of modern society, but we should also be wary of single-spigot fountains of information that come via unverifiable channels. After all, the leaking of false information to promote an agenda is a time-honored tradition of statecraft.
100% this info was already sold to all other countries.
My main concern isn't that these secrets are getting exposed, its that they are getting exposed in a way that is easily editorialized by whoever is distributing them. Ordinarily US citizens wouldn't have access to our country's diplomatic cables (even though other countries might) - now we do have them, yet we have absolutely no way of verifying that we've gotten the unadulterated whole of them. That is what concerns me.