5
Spotlight Gets Smarter
Spotlight also works a bit like a silent version of Siri on iOS. Type in the name of a movie, for example, and Spotlight gives you links to nearby showings. If you're really intent on wasting time, click on some of the trailers that Spotlight also offers.

6
Safari Favorites
Safari gets a major makeover, with a single toolbar at the top (you can still display your old bookmarks bar by enabling it from a menu).

7
Keeping Tabs on Safari
In iOS, you can display a card-shuffle-style view of all your open pages in Safari. Yosemite gets a similar feature with its Show All Tabs view. You can open this view by clicking the button at the far right of the toolbar, with a keystroke, or from the top-line menu. Of course, the blank icon with the plus sign lets you open a new, empty tab.

8
Mail Tooltip
We'll get to the more eye-catching features in Mail in a moment, but here's one that a lot of users will appreciate: a dropdown menu that lets you quickly add a Bcc: and other address fields. Notice also the iOS-style light-colored plus icon at the right that replaces the garish button for adding addressees found in earlier version of OS X.