When you are driving and need to find something on your iPhone looking down at the screen is never a good idea. There are a number of features like Voice Control that can help minimize that and Nuance has a new app for the iPhone called Dragon Go that is for voice search. Nuance has a lot of tech that supports voice commands and it is the company that makes the voice recognition software in the Ford Sync system.
To use the app all you need to do is fire it up and then say what you want to find. It might also save you time finding things when you are at home and in the office too. For instance, you can get show times for movies that you want to see just by saying "Showtimes for" and the name of the flick you want. The app will find tweets about the subject and can send you to Wikipedia for more details.
The app requires network connectivity via WiFi, 3G, or EDGE connections to work and the iPhone has to be running iOS 4 or later to work. The app will work on the iPhone 3GS and 4 as well as the iPod touch with an external mic connected. The app is on the App Store at no charge right now.