fboweb.com has apparently integrated flight tracking with Google Maps. Here is more from their site:
"Last year, fboweb.com and Google worked some wizardry together and teamed up to enable easy flight tracking straight from the famous search engine.
We've now integrated their fantastic GoogleMaps application with our free flight tracking feature that functions off of their site.
You can go straight to Google and enter commercial flight information, such as "United Airlines 11" or even "UAL 11", and you'll be presented with an option to track the flight using fboweb.com and the new maps!"
Check it out here: