Too many tabs? Tab stacking lets users to drag one or more tabs over another to create a group
Opera has a Tab Stacking induction video on YouTube.
Other features includes extensions support, safer address field, enhanced HTML5 support. And Opera 11 beta allows users to have plug-ins (such as Flash content) loaded only when clicked (i.e. on demand).
Opera 11 Beta is available at http://www.opera.com/browser/next/
UserAgent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:184.108.40.206) Gecko/20101026 AlexaToolbar/alxf-2.0 Firefox/3.6.12