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Safari: Shared links
Shared Links allow you to keep up to date with new and interesting content from your friends and colleagues, based on what they post on Twitter and LinkedIn, for example. These links appear in your sidebar, but are also available on your iPhone or iPad.
Safari: Power Saver
Browsing the web can use up considerable amounts of battery life, particularly on clunky and out-of-date plugins that use intensive graphics and processing power, like Flash. Safari's new "power saver" trick holds these plugins and prevents them from running so they don't chip away at your battery.
Multiple displays recognized, managed
OS X Mavericks now takes "full advantage" of every display — including Apple TV-connected televisions — allowing users to easily navigate between the two. Each display now comes with its own menu bar and the Dock is available on whichever screen you're working on. Also, with adjusted full-screen capabilities, you can have one app in full-screen mode on one device and work with the desktop on the other.