In Pictures: OS X Mountain Lion arrives - the top ...
Dictation in all apps
Introduced in the third-gen iPad, voice transcription arrives on the Mac in OS X Mountain Lion. Using a keyboard shortcut or menu option, you can speak text in any text field or text window and have Apple's servers translate your dictation into text that is then placed in your field or document. Supported languages are English, French, German, Japanese, and Spanish.
In Pictures: OS X Mountain Lion arrives - the top 25 features