Best non-IM use of iPhone 3.0's push notifications yet: Prowl is a $3 app that pushes Growl notifications from your Mac to your phone.
Growl's a global notifier that plugs into everything from BitTorrent apps to iTunes to Mail.
The possibilities really are endless: You can be pinged with a push notification when a torrent finishes downloading, you get a new IM or email, you're mentioned on Twitter, or anything else Growl can notify you about.
While Prowl's designed for push notifications from a computer
