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1. Tab stacking

Opera pioneered powerful tabs. In Opera 11, 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.
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2. A safer address field

Opera's new address field hides the complexity of long web addresses and gives you better control of your security when browsing. Click on the badge for the website to see information about the site you are visiting. You can even get information about Opera Turbo data savings.

3. Extensions support

You can now browse Opera's extensions catalog to add new functionality easily and customize Opera just how you want it.

4. Visual mouse gestures

Mouse gestures are another Opera innovation that has been made easier-to-use with the addition of an interface that guides you. This allows new users to discover the speed and power that mouse gestures offer.

5. Better performance

Our developers have been hard at work fine-tuning our browser engine to put Opera even further ahead in a number of benchmarks. In Opera 11, pages load faster and complex applications run more smoothly.

6. Enhanced HTML5 support

Support for new standards and HTML5 technologies means that rich, dynamic web applications and multiplayer games can be supported by Opera 11.

7. Extended auto-update

A new auto-update system ensures that your extensions and Opera Unite apps are always up to date with the latest enhancements.

8. Search predictions from Google

Search suggestions predict queries as you type, making searching quicker and easier. Google search predictions are now built into Opera. When using the search field or searching from the address field with the 'g' search keyword, Google search predictions will appear.

9. Plug-ins only on demand

An option has now been added to have plug-ins such as Flash content load only when clicked. This is especially helpful to speed up browsing on computers that have difficulty handling lots of plug-in content.

10. Enhanced email in your browser

A new mail panel gives you control over the order in which your accounts and mail items show up. You can just drag items where you want them. The mail panel can also show your mail panel when you are using it and hide when you leave a mail tab.

11. Faster installation

Even with its many new features, Opera 11 is 30% smaller than Opera 10.60. That means that Opera downloads more quickly and installs in fewer steps. Getting Opera on your computer is easier than ever.

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I'm using it now. It's great. The visual mouse gestures are interesting I must say

/cue ep browser war

This is awesome D:<

allright! downloading.

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ooh speedy. the scroll wheel is a little too responsive. but it definitely seems faster than ff

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AND INTEGRATION WITH MY THEME!!!!!

looks nice.
made a profile @ My Opera: hecaitomix

This looks pretty neat, it might be enough to push Firefox off the pedestal of "favoured web browser".
Are the mouse gestures compulsory, or can you have a good old-fashioned context menu? I've nothing against mouse-gesture driven browsing, but I don't really like wagglan.