King County Metro Transit's website has a java based applet that shows you the real time progress of its network of buses.
Tracker Map View uses a JAVA applet to display real-time Metro transit vehicle locations. The applet should launch automatically upon reaching this page. If it does not, please check the system requirements. If you have closed the Tracker Map View applet and want to re-launch it again later, please reload/refresh this page.
Would be nice to have something like this here in Allegheny County!