I,ve also just downloaded Waze, heard a few good reports of it diverting you away from traffic jams..
I use Waze most of the time because it can alert you to hazards, potholes, police, roadworks, congestion delays etc. Most of these are inputted by you the driver as you pass, Waze will tell the next cars and ask if the hazard is still there. It is also owned by Google maps.