Believe it or not, dictation is built into the Mac, just as it is on the latest iPhones and iPads. You can speak to type.
In fact, OS X’s dictation feature is almost identical to the iPhone/iPad’s. It lets you speak to enter text anywhere, into any program, just by speaking. (Behind the scenes, it’s using the same Nuance recognition technology that powers Dragon Dictate.) You can blather away into an email, fire off a text message, or draft a memo without ever looking at the screen.