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Another new app: Notes. You can scribble something down on your iPhone, iPad, or iPod touch, and see it live on your Mac. Notes supports iCloud.
It supports text, images and links, which means you can bang in a recipe on your Mac from your favourite cookery website, and see it straight away on your iPhone or iPad downstairs.
Lost mode also works in "Mountain Lion", just as it works in iOS 6. If you lose your Mac, you can send it a message. You can also remotely lock your Mac in true iOS-style, and even remotely wipe the device from iCloud.