SEPTA Selector is an Web application using data derived from SEPTA which tracks a massive fleet of buses. This is basically the transit enthusiast verison of Transitview. This app enables users to sort which type of buses would appear up, whether it is Nova, NABIs, Neoplans, or New Flyers. The user can also sort by depot as well.
Please check it out:
http://www.philadelphiatransitvehicles.info/SEPTA_selector.html