Similar to when Apple brought Siri to the iPad in the form of dictation software, they announced at the Developers Conference today, that they with bring that same functionality to the new line of Macbooks. The new Apple OS, Mountain Lion, will contain iPad style dictation.
This is not the full version of Siri, but it can be used for dictation. Hitting the microphone button allows you to speak dictation to a number of software application including Facebook and third party applications like Microsoft Word.
Dictation, because Apple should have access to my every thought. Privacy is dead.