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Update: NationMaster is now entirely free. NationMaster assures potential users that it is not a scam site, and is attempting to nullify any problems they had in their billing and support areas.

Update 2: As of Nation Master's most recent email, NationMaster's problems have apparently returned. For more information, please read NationMaster Watch

Adam at The Metropolis Times gives a good summary of what has happened. Another synopsis is also available.