General
-Option to save directly to iCloud from Save dialog in TextEdit (and presumably any app that supports iCloud document syncing)
-When a document that is using Versions is changed, the "Edited" in the titlebar of the document pulsates blue for a few seconds.
-"Duplicate" now has a keyboard shortcut: Cmd-Shift-S. When you select Duplicate, a copy of the current document pops out and the titlebar becomes an editable text field, allowing you to enter a new name, hit enter, and be done.
-Option to show the Displays menu item "Never," "Always," or "Automatically" (presumably only when you have a second display connected)
Safari
-New "Passwords" tab in Safari preferences
-"Tell websites not to track me" option
-Option to turn off Google/Bing/Yahoo search suggestions
-Websites can provide notifications in Notification Center
-"Display images when the page opens" option (default is obviously checked)
-Several sharing options when right-clicking on an image on a page: Email, Message, Twitter, AirDrop, and Flickr
-Ability to rename bookmarks directly in the Bookmarks Bar
Finder
-New "Share" submenu when right-clicking on a file: Email, Message, AirDrop
Dashboard
-The widgets bar along the bottom for adding new widgets has been replaced with a Launchpad-style picker - including the ability to search.
QuickTime X
-Controls remain hidden when the movie is paused