Dragon Go!

Dragon Go! is an easy-to-use voice recognition app powered by Dragon
NaturallySpeaking that allows you to easily speak and instantly see your SMS,
email, or social networking updates on the iPhone, iPad, or iPod touch. 

Free on the iTunes App Store

Dragon Go!
http://www.nuancemobilelife.com/apple/go.html

Download
http://itunes.apple.com/us/app/dragon-go/id442975871?mt=8&ls=1