Robert Peake has a quick post on an update to the PEAR package Net_Monitor.

Net_Monitor now supports the latest release of Net_Growl (announced yesterday). Growl is an attractive global notification and alert system for OS X. Versions 0.7 and above support remote messaging via UDP, which makes this yet another useful way to receive alerts from the Net_Monitor package about the status of many common services it can monitor.

The Net_Monitor_Alert_Growl class is currently available via cvs for your perusal.

Definitely sounds like a cool little project. I've never really looked into the Growl stuff before, but being a Mac fan, I'm always interesting in cool little apps like this - especially when PHP knows how to interact with it...