I have to agree http://scanamerica.us is the best. I was recently almost 400 miles from my department's run area and was able to listen to everything that was going on in my town using this site.
My county recently upgraded to a new radio system and there are a lot of "private" channels that I can't even pick up on my portable radio but with ScanAmerica's online scanner I can hear it all. It is the greatest way to keep informed even when you no where close to the incident.