Your Facebook notifications work with Notification Center in Mountain Lion, and you can even update your Facebook status from within Notification Center.

ENGADGET: Apple brings Dictation to the Mac, tells Siri to stay in the car

Both units will include status reports as well as notification of successful completion of message.

CNN: E-mail arrives in your pocket

To be frank, my favorite notification method implemented on any mobile OS is the status bar on Android, mainly because it's easily accessible and navigable the vast majority of the time (it gets hidden in certain apps).

ENGADGET: Back to BlackBerry: closing time Mobile