iPhone users who had been using Voice Dialing feature in their earlier phones miss this feature the most in iPhone while driving. In fact there have been rumors that Apple might bring voice dialing feature in upcoming 2.2 or later firmware updates. Till that happens, lets look at few of the most downloaded Voice Dialing Apps from iTunes AppStore:

• Say Who – Dialer: Free [AppStore]

  Most Recommended - Now make calls by speaking any NAME or NUMBER – accurately and quickly. Why dial when you can speak?
  Just say any NAME in your contact list! Entire names, or just first or last names. Plus, say things like “At Home”, “On Mobile”, or “Office”. Also, say a PHONE NUMBER!

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• SayNDial: Free [AppStore]

  Recommended - Free for a limited time during this launch period!
  SayNDial automatically dials one of your contacts just by saying a name or company. It recognizes your speech making it faster than thumbing through your contacts and safer when calling while you drive.