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iCloud Keychain: Synchronizing card payment details in the cloud
And when you're back at your Mac and enter your credit card data that was stored by your mobile device, it grabs that data from iCloud.
Safari: New start screen; top sites
Top sites are now arranged by last viewing and popularity, and can be easily shifted around, pinned, or deleted from the page. It's also cleaner and "flatter" in design, in line with its iOS 7 counterpart.
Safari: Seamless article reading
Articles saved to the browser's reading list now stream seamlessly one after the other. Once you scroll to the end of one article, the next one loads automatically.