Jakkedup there's even an easier way...
IF it's exactly the same service you can just add the hosts names in one single service definition.
Using the output of the "Host Detail" page, awk, and a bit of cut and paste i can add a service for all hosts in... what.. say 5 minutes?
I Believe much depends on being GUI addicted or not.. i started to work on nagios in vi and i continued.... the trend will be towards the GUIs... i fear. well what the heck could be useful working in the IT business..