As predicted Google has announced their own free turn-by-turn navigation app. Clearly Google has been working hard to integrate various data map sources, from government data (like the US census TIGER data), user supplied data and Google's Streetview data. I am really not a big fan of companies like TeleAtlas and Navteq who controlled all the map data for decades, but I don't like Google's approach of exploiting user supplied data and destroying businesses just because they can can. Daniel Lyons sums it up very nicely.
The voice search looks pretty good but at this point plenty of companies have that technology. The TTS doesn't sound so hot.
I really hope that Apple will come up with their own solution, maybe based on OpenStreetMap and Cloudmade, especially since Google is a US only solution at this point.