The most full-featured Internet power tool on the market, Opera includes pop-up blocking, tabbed browsing, integrated searches, and advanced functions like Opera's groundbreaking E-mail program, RSS Newsfeeds and IRC chat. And because we know that our users have different needs, you can customize the look and content of your Opera browser with a few clicks of the mouse.

Changelog
Added Core version (currently "Presto/2.1.1") to the User-Agent header; all our products will include this feature soon
Sites using HTTP Auth are now saved in typed history
Added setting to prevent bookmarks from showing in the Address field auto-completion drop-down
Properly stop loading pages with iframes when closing the page or pressing stop
Fixed problem where dynamically added xml-stylesheet processing instructions were ignored
Removed the document project from iframe objects for compatibility with Gecko, WebKit, and the Acid3 test
Added support for the caller property on functions
Fixed yet another case of having to press the back button twice
Improvements to feed preview page
Made feed preview page template location customizable
Made reloading Speed Dial while offline actually reload all thumbnails
Fixed Opera Link issue where notes could end up blank after being synced
The Opera Link queue file is no longer created before using Link
The fraud protection dialog now works when using a proxy
Made it possible to remove Speed Dial search again by unchecking the "Use as default Speed Dial search"
Fixed text input on Windows Tablet PC Edition 2005
Fixed open/save of images in Opera Mail when using the image context menu
Made all top-level access points (except All Messages) selectable
Fixed a problem deleting drafts from the Drafts view
UNIX: Additional fixes to flash plugin handling. Freezes when using flash should now be mostly gone.