Opera 11 also comes with another major feature called tab stacking that will come in handy to those who have large numbers of tabs open on a regular basis. Basically, instead of keeping tabs alongside each other, tab stacking enables you to group them by site or theme, similar to what Panorama does in Firefox 4. To use it, simply drag one tab on top of another, after which you’ll see a small arrow next the tab that will let you expand or contract groups as needed.
Mouse gestures have undergone an upgrade in Opera 11, with a new visual interface highlighting available mouse paths, the address field now hides unnecessary information and puts the security status of each page front and center, plug-ins like Flash can be set to load on-demand, and browsing speed gets a small boost. You can download the latest version of Opera 11 Beta for Mac OS X and Windows – Linux users will have to wait a little longer or get the alpha here.