Found this site through CPTDB. It tracks the buses of many agencies, including the MTA (Bronx, Brooklyn, and Staten Island only), Rutgers, MBTA, Los Angeles Metro, TTC, Foothill Transit, and MUNI. I was even surprised to see my own City College buses on it. For example, you see see MBTA RTS #0326 on Route 80 and #0305 on Route 77.
http://doconnor.homeip.net/TransSee/
