You're the Pundit: What's the killer Mountain Lion feature

When it comes to forecasting the next big thing, we turn to our secret weapon: the TUAW braintrust. We put the question to you and let you have your go at it. Today's topic is Mountain Lion.

This week, a developer preview was released and Apple updated its site with a list of upcoming features. They range from an iOS-inspired Notification Center to Game Center support to integrated Twitter.

Which of these is the killer feature that will help define the new platform and set it apart from earlier operating systems?

You tell us. Place your vote in this poll and then join in the comments with all your predictions.

What is the killer feature for OS X Mountain Lion
Better iCloud integration, so my data goes everywhere I do	1274 (27.4%)
Reminders so I can manage my day regardless of my Apple platform	167 (3.6%)
Game Center because it's long past time for OS X to become "funner"	56 (1.2%)
Notification center and built-in Twitter integration, keeping me instantly on top of what's happening in my world	592 (12.7%)
Share sheets, so I can share my world out more easily	33 (0.7%)
AirPlay screen streaming to Apple TV	1402 (30.2%)
Messages, because it takes iChat to the next level	581 (12.5%)
Gatekeeper, because consumers will benefit in the long term	189 (4.1%)
The cool name. Although they should have gone with "Cougar" or "Melanistic Leopard"	152 (3.3%)
Something else. I'll tell you in the comments.	202 (4.3%)