That new and improved netcat was long overdue.. Great to see someone picking it up and taking it to the next level.. Eventhough netcat is a bit outdated these days I still find myself using it on an almost daily basis...

I'm also very interested in the future scripting capabilities of nmap

Code:
if($port == open) {
  case $port in
      80:    exec("HEAD http://$ip:$port");
      25:    exec("smtprelaycheck $ip");
}
Or something similar... cool