Dragon Dictation App for iOS
'Dragon Dictation is an easy-to-use voice recognition application powered by Dragon® NaturallySpeaking® that allows you to easily speak and instantly see your text or email messages. In fact, it’s up to five (5) times faster than typing on the keyboard.
With Dragon Dictation you can also dictate status updates directly to your Social Networking applications (Facebook and Twitter) or send notes and reminders to yourself….all using your voice. So when you’re on-the-go, stop typing and start speaking – from short text messages to longer email messages, and anything in between. '
This is a free app