Waze: Free. 4 1/2 stars (1,104 reviews). Top of the Feature Section. And Apple license their data for maps.
It is beyond me, why Apple didn't buy Waze. It's the best GPS application in the market between the free and non free. Adding a mapping function and all the bells and whistles should have been a walk in the park in the first place.
Waze is a solid product and its best feature is that it's socially based. I love the fact that not only it tells me if there are accidents on the road or cops hiding behind a sign, but it warns you of traffic in real time, weather conditions, and it works great!!
Still it's good they are putting Waze on the map by promoting it the way they are.