If your not familiar with Prowl, then check it out. It allows your growl notifications to be sent to your iPhone via push. I use this in several different ways on my home computer to notifications when I’m out at about. You can also access the prowl service directly with its API, so no need to even have it go to growl first.
I like using Prowl (in addition to Growl) with nagios. This allows me to get my notifications anywhere as long as I have my iphone. Just like with the growl notifications, the prowl notifications are just as easy to setup. It is very well documented here at the Reluctant Hacker.