The voice navi is nice, but seriously...
I feel like I'm listening to Max Headroom's sister.
More Stephen Hawking's sister IMO. Max Headroom spoke in sampled sound bites (that stuttered and repeated). Google Nav clearly uses text-to-speech synthesis.
The synthesis is obvious here in Phoenix where there are a lot of hispanic names.
For example, the voice navi told me to turn left on Estrella Parkway. That's pronounced ES-TRAY-YAH. Not ES-TRELL-UH. Estrella is the spanish word for "star". The phone should know that, it supports Spanish as one of the six languages it does.
My Spanish teacher would have me in detention for fifty years for pronouncing like the Droid navi chick.