Traffic Usage Checker (or TUC for short) is a small program that sits in your system tray and allows you to check your broadband traffic usage. It currently works with many ISPs: Paradise, Jetstream, InSPire, Xtra, Airnet, TelstraClear, WorldNet, ihug, Quicksilver, ACSOnline, or any jetstream account.
Please follow installation instructions on the download page.
Original GPForums thread is here.