I have created a simple script that runs dnscheck regularily and sends me an email when dnscheck finds any errors. By doing this I am notified if a zone transfer breaks, DNSSec-signatures gets outdated or any other anomalies in the DNS configuration of my zones.
I have also put together a form which can be used to add monitored zones to the database. Just visit dnschecker.nat0.net and add your email address and the zone you want to monitor. After verifying your email address my script will monitor the zone(s) you´ve added and send you an email if anything fishy is found by dnscheck.