As you may or may not know, one of the text inout options on the 4G is dragon dictation. You open any text input area, hit the bar, and speak. It is by far the best voice recognition software I have ever used. I would say it is better than 95% accurate. I believe it is the same software used for the genius button.
Long press any text input area, select input method, and choose dragon dictation. You wont be sorry!