Phil Sturgeon has posted a fun little script CodeIgniter users can use to connect their application with Prowl.
Most web-applications currently use automated e-mail's to let an administrator know someting is going on and some applications use Twitter. Why not use iPhone Push Notifications to get an alert to you immediately without having to check a thing?
He threw together a quick library that only requires a username, password and application name to set the messages. You can download the sample library directly from Github