OS X Lion features

Sending files wirelessly: Drag-and-drop file sharing: Lion features the new AirDrop, the easiest way to send files wirelessly to anyone around you. Just drag any file to send it - simple.

Cocoa AppleScript applets: Using the AppleScript Editor, create and edit Cocoa AppleScript applets that provide direct access to the Cocoa frameworks from their AppleScript code, using the AppleScript/Objective-C bridge introduced in Snow Leopard.

Full disk encryption: Previous versions allowed you to do this only partially, Lion uses FileVault to encrypt the entire drive on your Mac, helping keep your data secure.

Captive network: When connecting to a network that requires authentication, Lion opens a window permitting you to log in to the network.

SMB with DFS: OS X Lion supports DFS URLs, drill-down, failover, and reconnects when connecting to Windows file servers.

Applications resume when launched: Opening an application now brings you to where you left it, all windows and panels come back just as they were.

Enhanced graphic performance: Web pages that employ HTML5 Canvas element can tap into the graphics processing unit on your Mac to display graphics and animations. Improved hardware acceleration for Canvas, games and interactive web applications render faster and smoother in your browser.

Auto hyphenation in CSS3: Lion supports auto hyphenation allowing developers to provide better reading experiences and text layouts.

CSS3 vertical text alignment: Support for vertical text allows for top-to-bottom text layouts in web pages. With this you can now use better text positioning in languages like Chinese and Japanese.

Text emphasis: With the text emphasis property, CSS3 web pages can display emphasis marks in East Asian text.

Character picker: Accented characters accessed in OS X Lion is simple. As in iOS, hold down the letter and a dialog appears listing all alternative and accented characters.

Full-screen Terminal window: Make your Terminal window full screen and give yourself more room to enter and view command lines.

Xsan file system: Built into OS X Lion, allows any Mac with suitable connectivity to access an Xsan volume.

Sandboxing applications: Protects your system by reducing the kind of operations an application can perform, such as opening documents or accessing the network.

New process architecture: Surfing the web in Safari becomes even faster as one process handles web content, while another handles interactions with the browser interface.

Media caching: Safari stores audio and video data that use the HTML5 application cache, allowing for offline media playback and better media performance over a slow Internet connection.

Per-app location services: Control which apps use your location and information from Privacy preferences in System Preferences.

Capture a region of the screen: When recording with Quicktime, you can record only a part of the screen, like a specific window.

Multi-touch gestures: Use the multi-touch gestures to dynamically and efficiently scroll, zoom, browse through Safari, photos and other files (no more back or forward buttons, just swipe)

Full screen applications: Safari, Garage Band, iPhoto, and all standard Apple apps to be full screen

Mission control: A unified view of Expose, Spaces and widgets that can be accessed by a three-finger swipe

Mac App store: Taking the purchase of apps to another level with the App store built in to the Lion OS, customisable notifications and updates

Launchpad: Have all your newly purchased or downloaded apps neatly organised in the desktop at the tip of your fingers at a pinch's gesture

Resume: Takes you back to where you were when you quit an application, document or just about anything.

Autosave: You can "revert to the last opened file" or "lock" it so that it won't be changed. One click on "duplicate" and you're there.

Email: Improved view-ability, better applicability and better search capabilities.