There's a tool for the NYC/NJ airports here:
http://tracker.flightview.com/htNYNJ...RY&airport=EWR
One of its nifty features is the ability to list all traffic to/from an airport. A link to this for EWR is here:
http://tracker.flightview.com/htNYNJ...Map.asp?ap=EWR
It is based on a more generic tool that shows individual flights *or* traffic for a particular airport *or* all traffic:
http://www.flightview.com/TravelTools/