I just published an application that displays real-time status of Raleigh, NC's downtown buses. Currently, Raleigh's monitoring is limited the R-Line route.
The two buses show up as black dots. Red markers are bus stops. The blue line is the primary route, and the red lines show the evening (after 6:30PM) modified routes.
The app was fun to create. It leverages web services, Google's Map APIs, and Quattro's advertisement APIs. Sorry about the ads, but I couldn't help myself to try it out. They should at least be occasionally targeted to the RDU market.
Data updates every 5 seconds, although the bus data is usually only updated from the buses every 30 seconds.
Future enhancements I hope to include click-able markers to display the stop name, bus name, etc.
Make sure you've upgraded to version 1.16 to ensure you continue to receive bus location updates.