This may be the authoritative source on what is, and what is not dark sky in the USA. That is, unless of course, the evil axis of light-interested government factions and the shadow main stream media propagandists developed this link to obfuscate and confuse astronomers and the public at large into a false sense of security surrounding the events which are due to happen in 2012. Believe it!
NASA.GOV has a thing or two to say about dark sky values
Granted this is an old article, but how long has it really been since those dark sky maps have been updated anyhow? Comments welcome.