Nokia Sports Tracker PHP Class

I user the brilliant Nokia Sports Tracker application on my N95, and I upload my workouts to their online service, however, I want to be able to programatically get this data. It's mine afterall (?), so I wrote this small PHP class that takes a username, and can be used to retrieve public workout data from the site.

Simple example of use
// create a new instance
$nst = new NokiaSportsTracker("mattfink");

// get workouts (array)
$workouts = $nst->get_workouts();