If you use Mac OS X’s built-in speech service to read text back to you, you’re going to love this little gem!
Dictator is a free add-on that enhances built-in speech services by adding a progress indicator, a teleprompter (for reading along with the audio if you wish), and control audio with play, pause, and skip forward by sentence or paragraph controls.
To use Dictator, you simply select some text in any Services supported app (pretty much every app), right-click and choose Dictate from the menu.
You can download Dictater here.