If you're a subscriber to the free AT&T Navigator app and the associated service , then you'll want to load the latest update ASAP.
AT&T Navigator v1.7i is the newest version of the TeleNav-powered app, and it's now the first iPhone GPS navigation app that incorporates direct speech recognition. As you can see in the video above, all you need to do is tap an icon, speak your destination, and the app will display appropriate destination addresses. Tap one of the addresses, and navigation begins.
The new version also provides alerts for traffic cameras, works in landscape mode, and has a lane-assist function that shows you which lane you need to be in before you get to an intersection. When you need directions back to your home location, there's a new "shake to go home" function -- just shake the iPhone, and the app knows you want directions back home.
The free app works with a US$9.99 monthly service that appears on your AT&T iPhone bill. You can choose a monthly or annual subscription, and you can cancel at any time. Note that navigation is only possible in areas where you have cellular data coverage, as the maps are downloaded on demand.