Listen to Looney Tunes cartoons. All the characters sound like they are from Brooklyn.
I can say that I will not miss the accent. Used to work with a bunch of people from NY. "Hey, let me ax you sumpin. How would you like to eat a sqwirrel sangwich?"
Mel Blanc briefly discussing using the Brooklyn/Bronx accent he used for Bugs:
http://www.youtube.com/watch?v=wGO0n5ui2xU