I envy the Google Maps version in the US with the up to date layer of traffic info that can tell you where traffic congestions are and suggest alternate routes for your destination.
MMDA and TV5 launched a beta version of a traffic update service for 6 main roads in Metro Manila (EDSA, Quezon Avenue, Espana, C5, Roxas Boulevard and SLEX). It's years behind whats available in Google Maps US and GPS navigators there, but it's still a good start for Manila than nothing at all.
Traffic congestion levels are color coded red, yellow and green. System view, line view and Google Map views are available. The traffic condition is updated every 5 to 10 minutes between 6:00 AM to 10:00 PM.
I hope they get full integration will Google Maps for mobile phones so that Google Maps GPS navigation in Manila would be even better. For now you can access their website using either your PC or Phone connected to a wi-fi or 3G network.
System view of the traffic condition of parts of EDSA, Quezon Avenue and C5
Google Maps view of the traffic condition in EDSA