If you want to

take notes

or

enter text

on your iPhone but want to save your fingers the trouble of tapping then check out

Dragon Dictation

. It's a free app that will convert whatever you say into text with a fair degree of accuracy. It needs an active Internet connection in order to

process your voice into text

but, other than that one setback, it's an intuitive program that will slowly learn patterns from you and can use your Address Book to understand less than common names.