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Widgetbox, a marketplace for web widgets that's appeared on Mashable in the past, is set to launch a metrics service today. Widgetbox Syndication Metrics is basically a way to track the spread of your widgets on MySpace, hi5, Piczo, Xanga, blogs and elsewhere - you could think of it as Feedburner for widgets.
The metrics WidgetBox can track include the number of people using your widget, the number of hits your widget has received, the number of "referrals" (people who click the "Get This Widget" button underneath existing widgets), and the number of conversions (people who click "Get This Widget" and then post the widget on their own sites). You can also track your metrics over time and view graphs and pie charts.