SECOND UPDATE: (As of Jan 2014) The bus service from MRT-NAIA 3 is back
UPDATE: The bus service MRT-NAIA-3 vv has been cancelled.
But the shuttle between the 4 airports remain active.
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NAIA map from Wikipedia |
The Ninoy Aquino International Airport complex is a very complicated airport with four terminals that are far from each other. It's a bit of a hassle to transfer from one terminal to another. Going in and out of the airport, a taxi would be the best option. But if you do want to save money, there are also buses that connect all 4 terminals and there's a bus that links NAIA-3 to the MRT and LRT stations.
From MRT/LRT to NAIA

For those coming from the MRT and LRT stations, get off at the MRT-Taft station or the LRT-Edsa station. Walk to the nearest Mcdonalds near Sogo Hotel at the corner of Edsa and Taft. There's a bus terminal behind the building. Of course, look for the bus that heads straight to NAIA-3. There are signages, but you can also ask the guard or those working in pasalubong shops/carinedaria. Fare is P20.
If your flight is via NAIA-3, you're lucky since there is a direct trip. But if you need to go to NAIA-1, 2 or 4 (Domestic Terminal), you can still take the bus and transfer to another bus at the NAIA-3. From NAIA-3, there are buses that can take you to all other terminals. If you're heading to NAIA-4 or the Domestic Terminal, you have to inform the driver first, since usually they don't make a stop there. Fare is P20 for all routes.
If you plan to take the bus, it would be better to leave home earlier than usual, since you have to factor in traffic and the number of passengers, especially during peak season.
From NAIA to MRT/LRT

If you arrive at the NAIA-3, just go to the bus station right across the taxi station outside the Arrivals hall. Or you can also ask airport staff where it is. The bus can take you to Baclaran, Heritage Hotel, LRT/MRT stations and Tramo. If you see a long line, don't panic. Buses usually arrive every 5-15 minutes. Fare is P20 for all routes.

If you arrive at the NAIA-1,2 or 4, there are buses that can take you to NAIA-3 where you can take another bus to the MRT/LRT. You can ask airport staff for the bus station. At the NAIA-2, the bus station is between the Domestic and International Arrivals. Upon arriving at NAIA-3, you can go straight to the bus station that heads to MRT/LRT.
For those using NAIA-4, buses usually don't pass by the terminal. It's better if you take a cab. But if you see the airport bus, then you can hop on.
Hope the information helps. :)