Included is a syntax file for nagios config files. I modified it a little to fix a few things I encountered. Feel free to fix/modify it.
Created attachment 47674 [details] nagios.vim Nagios syntax file
Since the URL appears to be dead, I'll maintain this vim file on my dev space. I updated the headers to reflex the change in Maintainership, etc.
app-vim/nagios-syntax once it hits the mirrors. Cheers.
the syntax file still lives on in PLD Linux CVS: http://cvs.pld-linux.org/cgi-bin/cvsweb.cgi/SOURCES/nagios.vim
NOTE: I uploaded it also to vim.org: http://www.vim.org/scripts/script.php?script_id=2261