To avoid heavy traffic and waiting in long line just to get our marriage certificate from NSO, I availed it through Teleserv. I made my order on Monday, have it confirmed and then my wife received it by Thursday. Definitely a more convenient way in getting your NSO documents.
links: http://nso.citizenservices.com.ph
http://youtu.be/nw3tFJ1EyDo
links: http://nso.citizenservices.com.ph
http://youtu.be/nw3tFJ1EyDo