Best way to get from Newark (NY) to Philadelphia (PA) on land?

edited March 2010 in - USA
What's the best and cheapest way to get to Philadelphia from Newark? I don't want to fly so what's the quickest way for me to get there on land besides taking a cab?
Amtrak, Greyhound, rent a car?
Has anyone done this journey recently that has some good avice for me?
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