One of my favourite thing about Apple is how you get rewarded for having multiple products with things like AirPlay, iCloud sync, the option for iTunes Match etc. Notification center (great as it is) however does the complete opposite. Lets say I get an email to my @me.com address, I have to see the notification on my iPhone, iPad and Mac. Reading it on one device should tell the others to no longer display the notification - I know this is possible because iMessage syncs perfectly across all three devices, lets say I read a message on my iPad the notification vanishes on the Mac & iPhone. I'd like this to be applied to all notification center items, it can be really frustrating when I turn on my Mac and have 50 Twitter notifications in the corner which I've already dismissed twice on my other devices. Do you think this is something they could address in future versions of iOS?