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iMessage on the iPhone, iPad, and iPod touch allows you to send free unlimited messages to other iOS devices. Apple will expand this functionality to the desktop, allowing you to keep your contacts and devices in sync wherever you go. You can send a message from your iPhone and see the reply on your account-linked Mac or iPad.
Notifications will keep you in the loop on things you need to know and when, including software updates, birthdays and who wants to get in contact with you. It will likely include a "do not disturb" feature to prevent important meetings from being interrupted.
With the increased iOS-ification of Apple's desktop and laptop operating system, we are already seeing more applications porting from the iOS platform to OS X.
This includes: a new Reminders application to keep track of what you need to do and when, a Notes application to keep your lists simple and e-scraps of paper together, and a Game Center to keep all of your games in one simple-to-use place, just as it is on your iPhone or iPad.