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CAcert´s NetMonitor
CAcert´s NetMonitor is a tool to paranoidly monitor all DNS servers relevant for the domain, the contents of the domain, relevant changes to any of the servers. Additionally, it monitors the OCSP responder for availability and correctness of the answers.
http://svn.cacert.org/CAcert/Software/NetMonitor/
Ideas and tools that should be integrated as well: http://www.domaintools.com/mark-alert/