Opera 11 final available to download and came with many new features like Tab stacking, Safer address field, Visual mouse gestures, Extensions, Mail panel along with the previous features Opera Turbo, Speed Dial, Opera Link, Password manager, Opera Unite and Zoom.
Tab Stacking gives you control of grouping many tabs in to one allowing better management of tabs. Safer address field, An enhanced address field makes it easy to stay safe on the Web. The long addresses is hidden to make it clear which site you are visiting. A colored badge also indicates the quality of encryption that is used; clicking it gives you detailed information about the site. Extensions to extend the functionality of opera.
The video describes about the key features
Read more about the features at Opera 11