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.
Opera 11 goes to beta is available to download, The next major version of Opera came with many new features, Which includes tab stacking, lets you drag one tab over another to create a group. Now, you can keep dozens of webpages open, organized and under control, Extensions which gives you more functionality.
Opera 11 Alpha is available for testing, Extensions is one of the exciting new features in the Opera 11 alpha. Extentions allows you to add new functionality to Opera. Right now about 15 Opera extensions available for testing from the Opera Extensions archive.