Air Train Newark:  The Air Train offers connecting service to NJ Transit and Amtrak trains which will bring you into Manhattan. Surprisingly, this can actually be much quicker than taking a cab or bus, and it is much more affordable. $11.55 one way will bring you from Newark Airport to Penn Station. AirTrain connects the NJ Transit "Newark Airport Station" to the airport terminals. Consult the schedule to determine the schedule of connecting trains. Service is available from 5 a.m. until 2 a.m. 

Port Authority of NY and NJ

Taxis from Newark Airport:  Metered fare (plus tolls) to any Manhattan location, approximately $50-75. Taxis are available outside of every terminal and there is typically a taxi stand where you will be directed to a taxi. There is an additional charge for luggage over 24 inches if the driver handles the bags, and rates are based per car, not per passenger (up to four passengers). 

Taxis to Newark Airport:  Metered fare (approximately $69-75) plus return tolls and a $15 surcharge for a NYC Taxi to Newark Airport.

Car Services:  Pre-arrange for a car service to meet you at the airport, or call one when your flight touches down. This is a great option if you want to avoid waiting in line for a taxi or if you have a group larger than four people and want to arrange for a van or limousine.

Newark Liberty Airport Express :  Available from 4:00 a.m. - 1:00 a.m., these shuttles leave every 15-30 minutes for midtown Manhattan and every 2 hours to downtown Manhattan (from 11:30 a.m. - 5:30 p.m.). One-way fare is $13, but you can save by buying roundtrip tickets, as they are $22. One free child under 16 is included in the fare. You can choose to disembark at Grand Central, Port Authority or Penn Station, in addition to midtown hotels. The ride takes about ah hour. Return schedules and more information are available on their website. 

Super Shuttle: Available 24 hours a day, this shuttle provides door to door service for your party. Fares are $15 - $19, depending on destination. No reservations are required to get from the airport to your destination, but they are required for your return trip to the airport. Consult their website or call 1-800-258-3826 for more information. 

Rental Cars:  Consult this list of rental car companies serving EWR if you need to rent a car. I discourage visitors to New York City from renting cars, unless they're planning extensive travel outside of the major metropolitan area. Parking is both expensive and difficult to find, and you will find your money better spent on mass transit and taxis. Driving directions to and from EWR.

For other transit options, including suburban areas, inter-airport transfers and the five boroughs, consult Newark Airport Transportation Options.

Private Shuttles: Several companies offer shuttles to Manhattan, including: