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Here's an Applescript example which uses the standard os x notification :

Code:
set hostName to "192.168.1.15"

try
    do shell script "ping -qo -c 3" & space & quoted form of hostName
on error
    display notification "Host" & space & hostName & space & "is down."
end try

If you want to use Growl then take a look at the AppleScript Sample from the link. You can also use GrowlNotify from the command line.

Info : http://growl.info/downloads
 
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