Just discovered the hard way that my domain anniversary is today :-}
It's a reminder that I should make my old "checkwhois" a nagaina test. However, that's really a fallback - really something should let me schedule the updates a month in advance... except that I've never really used a todo system for that long...
Also probing whois will be expensive, or rather shouldn't be done every five minutes - so that means adding a way to do explicitly cached probes, which means having state (which so far this doesn't...)