Hi,

I also use Nagios at the company and I also do Windows box test with it without problems and out of the box, because what you really do is testing services that run on a machine. But the windows boxes can be count with the hands. :-)

I think the way to extending it (scripts) is very useful, because this way you can even write testers for special net services you could have developed.

Initial configuration could be a little annoying, but I think it's worth. I also like the idea to have a central server where all the network/supervise tools are installed, and not having daemons on the machines that give me some feedback.

By the side, Nagios with the Nuvola theme looks very nice :-D

Regards,